Questions Asked on
April 7, 2011

  1. physics

    A 15.5-m length of hose is wound around a reel, which is initially at rest. The moment of inertia of the reel is 0.42 kg · m2, and its radius is 0.170 m. When the reel is turning, friction at the axle exerts a torque of magnitude 3.63 N · m on the reel.

    asked by valem
  2. Chemistry

    A 100.0 mL sample of 0.20M HF is titrated with 0.10M KOH. Determine the pH of the solution after the addition of 100.0 mL of KOH. The Ka of HF is 3.5 x 10^-4

    asked by Alex
  3. Physics

    a) The x-coordinate of an electron is measured with an uncertainty of 0.20 mm. What is the xcomponent of the electron’s velocity, vx, if the minimum percentage uncertainty in a simultaneous measurement of vx is 1.0%. b) Repeat part (a) for a proton.

    asked by B. Ramez
  4. Physics

    A 65kg boy and his 40kg sister, both wearing roller blades, face each other at rest. The girl pushes the boy hard, sending him backwards with a velocity of 2.9m/s towards the west. Ignore friction. What is the minimum amount of chemical energy is converted

    asked by Hadeel
  5. chemistry

    If the reaction below proceeds with a 96.8% yield, how many kilograms of CaSO4 are formed when 5.97 kg SO2 reacts with an excess of CaCO3 and O2? 2 CaCO3(s) + 2 SO2(g) + O2(g) 2 CaSO4(g) + 2 CO2(g)

    asked by za
  6. statistics

    A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is 15. a) Compute the 95 % confidence interval for the population mean. b) Assume that the same sample mean was obtained from a sample of 120 items.

    asked by TIMBERLY
  7. Physics

    The moment of inertia of a solid uniform sphere of mass M and radius R is given by the equation I=(2/5)MR2 . Such a sphere is released from rest at the top of an inclined plane of height h, length L, and incline angle è. If the sphere rolls down the

    asked by Anonymous
  8. chemistry

    1 ) A sample of vapor occupies a volume of 125 ml at 100 celcius and 748 torr. What is its volume under STP conditions? 2) A sample of vapor weighing 0.745 g filled a 250 ml flask when placed in a water bath at 98 degree celcius. The barometric presure

    asked by mark matat
  9. geometry

    a trapezoid has an area of 4 square units and a height of 1 unit what are the possible lengths and bases

    asked by Anonymous
  10. chem

    Determination of the solubility product of PbI2. From the experimental data we obtain [I-] directly. To obtain Ksp for PbI2, we must calculate [Pb2+] in each equilibrium system. This is most easily done by constructing an equilibrium table. We first find

    asked by Tiffany
  11. physcis

    A stone is shown at rest on the ground a vector shows the weight of the stone. complete the vector diagram showing another vector that results in zero net force on the stone. b. what is the conventional name of the vector you have drawn

    asked by felicia
  12. Chemistry

    Silver ion reacts with excess CN- to form a colorless complex ion,Ag(CN)2 , which has a formation constant Kf = 3.0*10^20 . Calculate the concentration of [Ag] in a solution prepared by mixing equal volumes of 1.8×10−3m NaNO3 and 0.20M NaCN. When I did

    asked by Kris
  13. Prob. Math

    Sarah draws a card from a deck of 52 cards. She receives 40 cents for a heart, 50 cents for an ace, and 90 cents for the ace of hearts. The cost of a draw is 15 cents. How much will Sarah lose if she plays this game?

    asked by Traci
  14. math

    At the greenhouse where you work you need to make soil and vermiculite mixtures for potting plants. Flowering bushes need a mixture of 70% soil and 30% vermiculite by volume. About how many buckets of vermiculite should you add to 5 buckets of soil?

    asked by james
  15. chemistry

    what is the solubility of potassium nitrate (KNO3) in 100.0g of water at 80.0 degrees celcius?

    asked by veronica
  16. physics

    a climber with a weight of 441 N is held by a belay rope connected to her climbing harness and belay device; the force of the rope on her has a line of action through her center of mass. The indicated angles are θ = 45˚ and φ = 25˚. If her feet are on

    asked by john
  17. Physics

    A person is jogging at 3.5 m/s and grabs a rope that is hanging vertically from a tree. How high can the student swing?

    asked by Wendy A.
  18. Math

    Which statement is always true about a parallelogram? A. It has 4 congruent sides B. It has 4 right angles. C. It has opposite angles that are congruent. D. The sum of any 3 angles is 360 Is it a?

    asked by Mason
  19. Physics

    An explorer in the dense jungles of equatorial Africa leaves his hut. He takes 43 steps at an angle 45north of east, then 80 steps at an angle 60 north of west, then 51 steps due south. Assume his steps all have equal length. Save him from becoming

    asked by Allison
  20. physics

    Suppose that 90 g of hot water at a temperature of 75 degrees C is poured into a cavity in a very large block of ice at 0 degrees C. (a) What will be the final temperature of the water in the cavity? (b) What mass of ice must melt in order for the water to

    asked by sara
  21. physics

    an oil drop has a charge of 8.0 x 10^-19 C. How many excess electrons does the oil drop have?

    asked by Sejul
  22. Geometry

    The area of a regular octagon is 25. What is the area of a regular octagon with sides five times as large as the sides of the first octagon?

    asked by Hannah
  23. Chemistry

    Draw structural formula for each reaction and state the type of reaction that is occuring: a. 4-nonene and fluorine gas b. hexane and oxygen gas c. pentanol and butanoic acid d. propene and hydrogen gas

    asked by Faro
  24. Physics

    In one section of the pool, there is a thin film of oil on the surface of the water. The thickness of the film is 1.0 X l0^-7 meter and the index of refraction of the oil is 1.5. The light source is now held in the air and illuminates the film at normal

    asked by Anthony
  25. Physics

    5. The surface of a glass plate (index of refraction n3 = 1.50) is coated with a transparent thin film (index of refraction n2 = 1.25). A beam of monochromatic light of wavelength 6.0 X 10^-7 meter traveling in air (index of refraction n1 = 1.00) is

    asked by Anthony
  26. chemistry

    Cobalt-60 is radioactive isotope used to treat cancers. A gamma ray photon emitted by this isotope has an energy of 2.13 x 10—13 J. What is the wavelength of this gamma ray in SI unit?

    asked by John
  27. math

    The ratio of the number of postcards john had to the number of postcards Zachary ha d was 4:9. Zachary had 45 more postcards than John. After giving some postcards to John, Zachary had 6/7 as many postcards as John. (A) How many postcards did Zachary have

    asked by kaykay
  28. physics

    I need help confirming my answers: 1) The work done on an electric charge equals a) IR b)q/t c)Vq d) It I think it's C.(Vq) 2) The direction of an electric field is the direction that a ___ test charge will move when placed in the field. a)negative b)

    asked by Katie
  29. Math

    Can a golden rectangle have a shorter base than height? I'm not sure how to answer this can you please help :)

    asked by Jake
  30. economics

    how would you illustrate the impact of each of the following events on a production possibilities curve for factory goods and farm goods? a.) the computer in invented b.)1 million farm workers remain unemployed for six months c.) a drought

    asked by dana
  31. PHYSICS

    Given: The energy equivalent of one gallon of gasoline is 1.3 × 108 J. A compact car has a mass of 847 kg, and its efficiency is rated at 18.1%. (That is, 18.1% of the input power available is delivered to the wheels.) Find the amount of gasoline used to

    asked by anonymous
  32. Physics

    The seeing ability, or resolution, of radiation is determined by its wavelength. If size of an atom is of the order of 0.1 nm, how fast must an electron travel to have a wavelength small enough to “see” an atom?

    asked by Vanda
  33. English

    Explain how Tom Joad's imprisonment affect the way he behaved during the journey and throughout his search for work in California.

    asked by liz
  34. CHEMISTRY HELP!

    a. According to the Henderson-Hasselbalch equation, how many grams of sodium acetate will you need to add to 125 mL of 0.100 M acetic acid to make a pH=4.74 buffer? (I found this to be 1.025g) I need help with the rest b. What is the actual pH of the

    asked by Anonymous
  35. chemistry

    A 6.58g sample of compound was placed in a 12.6 L container. At 25.0*C, the pressure was found to be 0.75 atm. what is this compound?

    asked by Help
  36. Prob. Math

    Two teams have played each other 14 times. Team A won 9 games and team B won 5 games. Bob offers to bet $6 on team A winning while you bet $4 on team B winning. The winner gets $10. How much money should you expect to lose on such a bet? (Round to the

    asked by Traci
  37. psychology

    particular factors encourage people to be drawn into liking one another. in this context the reciprocity of liking effect is primarily associted with? a.) exposure b.)propinquilty c.) similarity d.) physical attractiveness. I think its D but not 100%

    asked by alisha s
  38. language arts

    from the following words I got to separate them into 3 groups: omitted syllable, omitted letter, and added syllable. drowned, restaurant, ivory, chocolate, desperate, lightning, adjective, penetrate, aspirin, athletes, identity , sisastrous, ecstatic,

    asked by Matthew
  39. Chemistry

    Determination of the solubility product of PbI2. From the experimental data we obtain [I-] directly. To obtain Ksp for PbI2, we must calculate [Pb2+] in each equilibrium system. This is most easily done by constructing an equilibrium table. We first find

    asked by Laura
  40. calculus

    determine the dimensions of a rectangular solid (with a square base) with maximum volume if it's surface area is 289 meters

    asked by Kate
  41. geometry

    A triangles shows the altitude qt and pm of triangle pqr. If qr=8cm , pr=7cm and qt=4cm what is pm?

    asked by Onile ganiyu lukman
  42. physics

    An engine provides a 10kw of power to lift a heavy load at a constant velocity a distance 20m in 5s. what is the mass of the object being lifted?

    asked by Anonymous
  43. Chemistry

    Tooth enamel is made up of hydroxyapatite, Ca_10(PO_4)_6(OH)_2 or the empirical formula, Ca_5(PO_4)_3(OH). Use the empirical formula for all calculations because stoichiometry plays two significant roles. A. Print the balanced chemical equation for the

    asked by John
  44. Physics

    An 8.5 x 10^2 elevator is pulled up at a constant velocity of 1 m/s by a 10 kW motor. Calculate the efficiency of the motor.

    asked by Wendy A.
  45. physics urgent!!!

    A canoe of mass 70 kg with a paddler of mass 55 kg are in a river. If the river's current exerts a force of 15 N [E] while the paddler is paddling with an average force of 22 N [N38degreesW], find the acceleration of the canoe and paddler. Use both a

    asked by Jess
  46. Physics (please help!!!!)

    Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such

    asked by Eduardo
  47. Physics

    A raindrop (mass 1.00 g) is travelling at a speed of 40m/s when it hits the surface of 100 g of water contained in a drinking glass. What is the change in temperature of the water in the glass if we assume that a) all the kinetic energy of the raindrop is

    asked by Mark
  48. Math

    During scuba lessons Sue dove 30 feet. Harriet dove 120 feet, and Kathy dove 90 feet. What integers represent these depths? Order the integers from least to greatest. Is it 30, 90, 120 or is there something else I need to do?

    asked by Scott
  49. Physics

    Suppose Fuzzy, a quantum mechanical duck, lives in a world in which h = 2 J.s. Fuzzy has a mass of 2.0 kg and is initially known to be within a region 1.0 m wide. a) What is the minimum uncertainty in his speed? b) Assuming this uncertainty in speed to

    asked by Abby
  50. physics

    In a scene in an action movie a person is being chased across a roof top. To escape, the person runs off the edge of the building and falls to the roof of a nearby shorter building. The tall building is 50m high, the short building is 40m high and there is

    asked by H.T
  51. physics

    A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 25.0° and the angle of refraction is 14.0°, find the critical angle for the liquid when surrounded by air. im not sure how to start this problem.

    asked by julie
  52. Math

    The perimeter of two equalater triangles are in ration 2:3. If the perimeter of the smaller triangle is 16 cm what is the measure of a side of the larger triangle?

    asked by xAlgebrax
  53. chemistry

    Hello! Please correct me if I'm wrong. For the following compound, predict whether the solution is acidic, basic, or neutral and why: NH4Cl. a) acidic, NH4Cl is the salt of a weak base b) neutral because there is no hydrolysis c) acidic, NH4Cl is a strong

    asked by polkadot
  54. Trigonometry

    cos(54º-X)=sin2X

    asked by Michelle
  55. Physics

    Suppose Fuzzy, a quantum mechanical duck, lives in a world in which h = 2π J.s. Fuzzy has a mass of 2.0 kg and is initially known to be within a region 1.0 m wide. a) What is the minimum uncertainty in his speed? b) Assuming this uncertainty in speed to

    asked by Abby
  56. Physics (please help!!!!)

    Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such

    asked by Eduardo
  57. Physics Please help!!!

    Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such

    asked by Eduardo
  58. math

    Find the exact value (either decimal or fractional form) of the first term of an arithmetic sequence if the sum of the first 100 terms is 7099.5 and the sum of the next 100 terms is 20799.

    asked by Janice - Please Help!!!
  59. 9th grade math word problems

    i never can do word problems....please help... i got 7 of them.....these are word for word 1) Larry is 8 yrs older than his sister.In 3 yrs, hr will be twice as old as she will be then.how old is each now? 2) Jennifer is 6 yrs older than Sue. in 4 yrs, she

    asked by Angel
  60. college chem

    a. According to the Henderson-Hasselbalch equation, how many grams of sodium acetate will you need to add to 125 mL of 0.100 M acetic acid to make a pH=4.74 buffer? b. What is the actual pH of the resulting buffer when you add that many grams of sodium

    asked by Cat
  61. psychology

    Whether you're persuaded by a message will primarily depend on which factor? a.) your preception understanding of the recipient of the message b.) your characteristics, including your personality and intelligence c.) whether your receive the message while

    asked by alisha s
  62. physics

    A 0.210 kg plastic ball moves with a velocity of 0.30 m/s. It collides with a second plastic ball of mass 0.109 kg, which is moving along the same line at a speed of 0.10 m/s. After the collision, both balls continue moving in the same, original direction,

    asked by James
  63. PHYSICS

    An object is attached to an ideal spring. It undergoes a simple harmonic motion with a total energy of E = 2.2 J. The amplitude of the motion is 0.7 m and the maximum speed of the object is 0.5 m/s. Find the spring constant.

    asked by Unknown
  64. English

    Huck struggles to decide what he should do when his heart and his conscience pull him in different directions. He eventually decides to go with his heart. * Write a short essay explaining why you agree or disagree that this was a good strategy for Huck to

    asked by Elizabeth
  65. physics

    A canoe of mass 70 kg with a paddler of mass 55 kg are in a river. If the river's current exerts a force of 15 N [E] while the paddler is paddling with an average force of 22 N [N38degreesW], find the acceleration of the canoe and paddler. Use both a

    asked by Jess
  66. chemistry

    which system is under higher pressure, a column of mercury or a column of water

    asked by lulu
  67. childcare

    You're a teacher in an area day care center. Before your children arrive each morning, you set up several areas with a variety of hands-on activities. As each child arrives, he or she chooses an activity that interests him or her. What type of curriculum

    asked by Heather
  68. Quantitative methods

    the mean and standard deviation of the grades of 500 students who took an maths exam were 69 and 7 respectively. if the grades have a bell shaped distribution, how many of these students received a grade of more than 83 marks?

    asked by lisa
  69. math

    A line segment has an endpoint at (3,2). If the midpoint of the line segment is (6.-2), what are the coordinates of the point at the other end of the line segment?

    asked by jake
  70. Quantitative methods

    the mean and standard deviation of the grades of 500 students who took an maths exam were 69 and 7 respectively. if the grades have a bell shaped distribution, how many of these students received a grade of more than 83 marks?

    asked by lisa
  71. social studies

    I need a lot of help. Which of the following statements best explains why many believed that Constantinople would be a better seat for the head of the Christian church than was Rome? A. Constantinople was closer to the Holy land B. Rome was remote and

    asked by Rebecca
  72. Physics (please help!!!!)

    Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such

    asked by Eduardo
  73. English

    Urgent! Can someone please look these over? The sentences are very vague (welcome to online schooling, I guess). Some of them are questionable. Please help! Need to write whether the sentence is a "POINT" or "TOPIC" sentence. Point Sentence-Announces the

    asked by Danielle
  74. precalc

    What are parametric equations? How would you find the rectangular eq's when given parametric eq's? and how would you find parametric eq's when given rectangular eq's? for example, given x=cos4t and y=sin4t (t is between 0 and 2pi) what is the retangular

    asked by Haley
  75. Math

    Akira is selling raffle tickets to raise money for the school band. The odds aginst winning a prize in the raffle are 9:1. What is the decimal probability of winning a prize?

    asked by Taylor
  76. math

    The ratio of the number of postcards john had to the number of postcards Zachary ha d was 4:9. Zachary had 45 more postcards than John. After giving some postcards to John, Zachary had 6/7 as many postcards as John. (A) How many postcards did Zachary have

    asked by anna
  77. physics

    alpha particles are accelerated through a potential of 1000volts and then enter a magnetic field 0.2T perpendicular to the their direction of motion.Calculate the radius of the circular path that they traverse.An alpha particle has a mass 6.68x 10^-27kg

    asked by ike
  78. physics

    The potential difference applied to an X-ray tube is 5 kV and the current through it is 3.2 mA. Then the number of electrons striking the target per second and speed at which they strike?

    asked by sunil
  79. chemistry

    What total mass of a 16 gram sample of 60co will remain unchanged after 15.8 years?

    asked by Anonymous
  80. physics

    Two particles, each of mass 6.00 kg and speed 4.67 m/s, travel in opposite directions along parallel lines separated by a distance 4.89 m. What is the magnitude of L, the angular momentum of the two-particle system around a point midway between the two

    asked by john
  81. physics

    A 0.203 kg plastic ball moves with a velocity of 0.30 m/s. It collides with a second plastic ball of mass 0.106 kg, which is moving along the same line at a speed of 0.10 m/s. After the collision, both balls continue moving in the same, original direction,

    asked by Joey
  82. physics

    alpha particles are accelerated through a potential of 1000volts and then enter a magnetic field 0.2T perpendicular to the their direction of motion.Calculate the radius of the circular path that they traverse.An alpha particle has a mass 6.68x 10^-27kg

    asked by ike
  83. mathematics

    hence calculate the value of x if the area is 25cm2

    asked by nompumelelo
  84. math

    A bell rings every 2 hours, a second bell rings every 3 hours, and a third bell rings every 4 hours. If all 3 bells ring at 9:00 AM. , at what time will all 3 bells next ring?

    asked by Anonymous
  85. MATH

    Region A that on xy-plane is bounded by two (2) curves and a line. The curves are y=x^3-2x+3 and y=-x^2+3 while the line is x=0. It is located in the first quadrant of xy-plane. Determine the area of region A.

    asked by AIRA
  86. math

    i never can do word problems....please help... i got 7 of them.....these are word for word 1) Larry is 8 yrs older than his sister.In 3 yrs, hr will be twice as old as she will be then.how old is each now? 2) Jennifer is 6 yrs older than Sue. in 4 yrs, she

    asked by Angel
  87. Math

    The product of two numbers is 108, and the quotient is 12. What are the two numbers.

    asked by Emily
  88. 4th grade math

    explain why it can be better to use compatible numbers to estimate rather than rounding.

    asked by megajolt
  89. Physics

    A 225 kg box is loaded onto a truck by pulling it up an inclined plane (10 m hypotenuse difference) by a force that is parallel to the incline (T = 315 N). If the bed of the truck is 1.2 m above the ground what is the efficiency of this simple machine in

    asked by Matt
  90. math algebra

    factor 20x^3-4x^2-72x

    asked by Anonymous
  91. chemistry

    If 448 L of ethene gas are reacted with excess water at STP, how many grams of ethanol will be produced?

    asked by alex
  92. Maths

    A swing 5 metres long swings through a vertical angle of 50 degrees. Through what vertical distance does the seat rise in going from its lowest position to its highest?

    asked by Gabrielle
  93. Math

    Rename each mixed number in simplest term 1.1 7/5 2.5 10/6

    asked by Frances
  94. algebra

    perform the indicated operation and simplify013/18 /20/27

    asked by victoria
  95. childcare

    Two-year-old Gerald is starting at your day care center tomorrow. His mother is going back to work for the first time since Gerald was born. You have four groups at the center. In which group should you place Gerald? A. A group of six toddlers B. A group

    asked by Heather
  96. physics

    i'm in 5th grade and i really need some help. in science, we got this science packet that's really hard. it's really hard. the question is: Jarrod measured the temperatures of two containers of water with two different thermometers. The water in Container

    asked by deja
  97. Chemistry

    Why do tomatoes grow better in a greenhouse?

    asked by Rashmi
  98. social studies

    I need a lot of help. Which of the following statements best explains why many believed that Constantinople would be a better seat for the head of the Christian church than was Rome? A. Constantinople was closer to the Holy land B. Rome was remote and

    asked by Rebecca
  99. math urgent!

    Tyler is on the 15th floor of a building. She throws a ball straight down from the window, which is 220 feet above the ground. How fast must she throw the ball(in feet per second) for it to hit the ground in 3 seconds?

    asked by lily
  100. Advanced accounting

    Up owns 80% of Down. During 2009 Down began selling merchandise to Up at gross profit margin of 20%. Sales by Down to Up for the year totaled $80,000, of which $10,000 remain unsold. In 2010 Down sold $100,000 merchandise to Up at gross margin of 40%.

    asked by Oksana
  101. math

    Tasty squares- Fiber-3 grams Oaty bits- Fiber: 10 grams QUESTION You should get 25 grams of fiber a day. How many serving of each cereal would it take to get 25 grams of fiber? Tasty squares 21 serving Oaty bits 15 serving

    asked by 3th grade
  102. English huckleberry finn

    The book ends with Huck saying he's going to "light out for the Territory ahead of the rest." But there's a part of me that wonders if he won't decide to go back home to the Widow's with his friends. * Write a short paragraph or two to make another "last"

    asked by Elizabeth
  103. Buisness Law

    What is the function of a negotiable instrument? Describe the essential elements of a negotiable instrument.

    asked by Kevin
  104. Chemistry

    I did an experiment using 20ml of 0.1M acetic acid and added 8ml of 0.1M NaOH. pH obtained after adding NaOH was 5.2. How do i calculate the mols of NaOH that reacted? mols of acetate formed, acetic acid initially present and acetic acid unreacted. Also

    asked by Jude
  105. calculus

    find the derivative f(x)= 8ln(x^5-2x)

    asked by kelly
  106. Geometry

    In the accompanying diagram, ABC and AB are congruent to BC. If the coordinates of C are (2,3) and the coordinates of B are (0,0), find the coordinates of A.

    asked by Brad
  107. physics ( help)

    A large (15kg) holiday decoration is suspended on either side of Hay Street in Perth by two cables stretching between buildings. The length of the first cable is 8m, the second is 6m and the buildings are 12m apart. The 8m rope hangs at an angle 26.4°

    asked by H.T
  108. chemistry

    If you have 200. mL of a 0.50 M solution of KOH and you wish to dilute it to 0.30 M, how many mL of water should you add?

    asked by Anonymous
  109. us history

    from fdr's first inaugral speech ,how did he attempt to win the support of the american people for his leadership during the economic crisis of the great depression

    asked by sandhya
  110. physics

    Electrons in a beam incident on a crystal at an angle of 300 have kinetic energies ranging from zero to a maximum of 5500 eV. The crystal has a grating space d=0.5A0, and the reflected electrons are passed through a slit .Find the velocities of the

    asked by Jen
  111. precalc

    solve the system of equations: x^(2)+y^(2) = 12 xy = -4

    asked by Haley
  112. math

    how do you make 25 1/3, 25 1/7 and 7 4/5 into a decimal? thank you

    asked by Sam
  113. physics

    you are given the formula d=30-q. use it to find a formula for q using d.

    asked by Anonymous
  114. fractions

    Rida has 32 pages to read for homework, she read 5/8 pages then took a break. She read another 5 2/3 after dinner. How many pages does she have to read?

    asked by ken robertson jr
  115. Chemistry

    Find the Ph: of 7.01 x 10-5 M Ba(OH)2 thanks:)

    asked by Rachel
  116. chemistry

    how much heat is absorbed when 500.g of copper goes from 25.0 celcius to 35.0 celcius?

    asked by Anonymous
  117. sat math

    (3+ab)(7-ab)

    asked by kiarra
  118. Trigonometry

    Proof the identity 1 + sin 2x/cos 2x = cos x + sin x/ cos x - sin x

    asked by Michelle
  119. Chemistry

    A student titrates 0.100M KOH, potassium hydroxide, into 50.0ml of 0.10M HCOOH, formic acid (Ka=1.8 x 10^-4. What is the pH of the mixture after 25.0ml of the KOH has been added

    asked by Gina
  120. Statistics

    For a set of data with mean 12 and variance 9, approsimately 68% of the values will fall between 6 to 18. Is the true or false and how do you find the answere?

    asked by Belinda
  121. Physics

    Electrons in a beam incident on a crystal at an angle of 30ͦ have kinetic energies ranging from zero to a maximum of 5500 eV. The crystal has a grating space d=0.5 Aͦ, and the reflected electrons are passed through a slit .Find the velocities of the

    asked by Abby
  122. physics

    A wire carries a current north. Above the wire the magnetic field is directed _________. Is it east? You are looking at a coil carrying a current clockwise. The magnetic field at the center of the coil is directed _________. Is it right?

    asked by Jennie
  123. 8th grade math

    How do you determine if a relationship's linear using a equation?

    asked by Alaura Amanda
  124. Math

    Find the unknown dimension width 5 1/2 ft 3 1/4 ft volume 143 ft3

    asked by Victor
  125. English

    Thank you very much. I need to wrie instructions of an MP3 player, a video recorder and a CD-player. Could you help me? I included a few more sentences. 1) I must be silent during teachers' explanations. I hang the clothes in the sun so that they get dried

    asked by Mike
  126. math

    what is the correct order from least to greatest: 3/8,0.23, 35%

    asked by luke
  127. psychology

    mandy has decided that she has no control over the aversive stimull she encounters at work and at home day by day. thus, she has given up trying to make her life better psychologists would say mandys worldview illustrates a.) emotion-focused coping b.)

    asked by alisha s
  128. English

    I forgot to include the following sentences. Thank you 1) Alonso is desperate because he thinks his son had drowned (or is drowned?). 2) Ariel informs Prospero aboutthe plan to kill him. 3) Dr Jekyll believed that man is (or was) a mixture of good and

    asked by Mike
  129. IGCSE 9th grade Chemistry

    Why do tomatoes ripen faster in a greenhouse?

    asked by Rashmi
  130. MATH URGENT!

    Madison is standing on the roof of a building that is 350 feet above the floor. She throws a ball straight up with a velocity of 20 feet per second. How long will the ball be in the air before it hits the ground?

    asked by lily
  131. science

    which typ(s) of RNA is/are involved in protein synthesis?

    asked by Sam
  132. Math

    During weeks in a certain flu season, the rate at which the number of cases of influenza per 100,000 people in a country changed could be approximated by I'(t)=3.298e^0.1044t where I is the total number of people per 100,000 who have contracted influenza

    asked by Hannah
  133. MATH

    IF A DOOR MEASURES 42" WIDE BY 84" TALL CAN A TABLE MEASURING 96" IN DIAMETER FIT THROUGH?

    asked by KAREN
  134. Geometry

    An architect is designing a public storage building with 2 different sized storage units the ceilings are 8 feet high in each storage unit a. All storage units have square floors the volume will be 1800 what are the dimensions of each small unit b. The

    asked by Nicole
  135. Chemistry

    A student titrates 0.100M KOH, potassium hydroxide, into 50.0ml of 0.10M HCOOH, formic acid (Ka=1.8 x 10^-4. What is the pH of the mixture after 25.0ml of the KOH has been added

    asked by Gina
  136. English

    What level of take home pay does one need to meet basic needs? to live comfortably? to not have to worry about having enough money? I don't know, like somewhere in the hundred thousands? I don't get this, please help!!!!!

    asked by Anonymous
  137. radius

    find the area of a 30 degree circle r or d. round to the nearist whole number. 1.r=2m 2.r=35in. 3.d=50cm 4.d=10ft. CAN YOU PLEASE HELP ME!!!!!!!!!

    asked by daniesha
  138. english

    I need help on writing an essay on how entrepreneurship affects me

    asked by brittney
  139. Data Management

    This is a hard question as it has a diagram. Basically the diagram states: Victoria - Montreal costs $580 Victoria - Saskatoon costs $230 Victoria- Toronto costs $505 Saskatoon - Toronto costs $398 Toronto - Charlottetown costs $395 Toronto - Montreal

    asked by Alicia
  140. Geometry

    In Circle A, AB=12 and measure of angle BAC= 60. Find the lenght of Arc BC

    asked by Anonymous
  141. english

    choose the subject and the predicate in these sentences????? 1.There is someone at the door. 2.Have a good time at the fair. 3.Go to your room. 4.Get the grocery at the ones. 5.Yesterday there was a full moon in the sky. 6.There are row of plants on either

    asked by madhur
  142. geometry

    For Chapeter 10. Section 7 in the workbook how would you work those problems because I have been looking at the tips in the book that explains what to do but as I try to apply those methods my answer seems to get tangled up from the way in the actual book?

    asked by Anonymous
  143. geometry

    what measure of an exterior angle of a hexagon? a)45 B)60 C)120 D)150

    asked by andrea
  144. math

    A bell rings every 2 hours, a second bell rings every 3 hours, and a third bell rings every 4 hours. If all 3 bells ring at 9:00 AM. , at what time will all 3 bells next ring?

    asked by Anonymous
  145. Physics-Please help!

    I don't want someone to do this for me-I'm just totally lost and don't even know where to start-I'm totally lost on this one- the earth is surrounded by an electric field with a strenth of 100 N/C at the surface. Its electric properties are the same as a

    asked by Rafaela
  146. logarithms

    Please help, im so confused. how would you solve: 2log(subscript6)(4) - (1/3)log(sub6)(8) = log(sub6)(x)

    asked by Haley
  147. US HISTORY

    from fdr's first inaugral speech ,how did he attempt to win the support of the american people for his leadership during the economic crisis of the great depression

    asked by sandhya
  148. Acid/Base

    Why is the normal concentration for HCl compared with the Molar Concentration of [H3O+] different? Why is The normal concentration for Acetic acid compared with the Molar Concentration of [H3O+] different?

    asked by Nicole
  149. Math/Geometry

    What are thre 3 figures of a 36 cm 2?

    asked by Azhye
  150. Chemistry

    At which temperature will the following reactions reverse? Use the thermodynamic date provided at the end of the book. a) 2Ca(s) + O2(g) -> 2CaO(s) b) 2CH4(g) + 4 O2(g) -> 2CO2(g) + 4H2O(g)

    asked by Amber
  151. Chemistry

    I can't figure out how to solve this problem: The Ka for hydroflouric acid is 4.5 *10^-4 at 298K. Calculate the amount of sold NaF that is required to prepare a 250. mL acidic buffer with pH = 2.75. The initial molarity of hydroflouric acid is .250M but

    asked by Jake
  152. English

    Explain how Tom Joad's imprisonment affect the way he behaved during the journey and throughout his search for work in California.

    asked by liz
  153. math

    At the end of an basketball game daniels couch told him he scored 20% of all of his teams points. If Daniel scored 19 points exactly how many points did his team score?

    asked by Justin
  154. sociology

    Is this statement correct as a social structure? Based on the Durkheim’s theory of social structure, this best matches who I am as a person and as part of a group. According to Durkheim’s theory, my social structure is based on the groups that one

    asked by Sharon
  155. algebra

    (1/(1+x))+(1/x) Factor

    asked by curtis
  156. geometry

    Suppose a triangle has side lengths of 6, 7, and 10. What best describes it? Acute, right, obtuse, or not enough information?

    asked by Michael
  157. 8th grade math

    The Exotic Pets Club has 23 members, all of whom have a snake, an iguana, or a tarantual. Four members have all three kinds of pets. Ten members have a snake, 14 have iguanas, and 13 have tarantulas. Two have a snake and an iguana, three have an iguana and

    asked by Kelly
  158. math

    230 divided by 2634

    asked by iano
  159. sociology

    Does Emile Durkheim theory of social structure have anything to do with a person veiwing their family closeness as being the primary group that matches that person social structure?

    asked by Sharon
  160. word problems

    I can never do word problems...please help!!!! Larry is 8 yrs older than his sister.In 3 yrs, hr will be twice as old as she will be then.how old is each now?

    asked by Bella
  161. Science

    If the volume of air at 23 Degrees C and at 710 mm Hg is 100 mL, calculate the volume at 25 Degrees C and 760 mm Hg.

    asked by Billy
  162. geometry

    find the area of a pentagon with the co ordinates of A(0,4) B(3,2) C(3,-1) D(-3,-1) E(-3,2)

    asked by Joy
  163. Statistics

    If the mean of a set of data is 20.00 and 12.20 has a z-score of -1.30, then the standard deviation must be: What formula would you use to determine this?

    asked by Belinda
  164. chemistry

    Write a paragraph explaining how to determine how many hydrogen atoms are in 6.5g of water. No equations are permitted in this answer.

    asked by alana
  165. Science

    Hi, I asked this question earlier, but didn't get any replies. If anybody could help, it would be extremely appreciated! A 225 kg box is loaded onto a truck by pulling it up an inclined plane (10 m hypotenuse difference) by a force that is parallel to the

    asked by Matt
  166. geometry

    Find the volume of a rectangular solid with the following dimensions: 2ã3 cm x 7ã5 cm x 4ã6 cm.

    asked by sara
  167. English

    Can you please check these sentences for me, please? It's urgent. 1) What do you think about going to the cinema? How about meeting at school? 2) How do I arrive at the school? I put the clothes back in the wardrobe. I put (is "take") the rubbish out once

    asked by Mike
  168. History

    Why do you think Native Populations were not included in the Democratic process?

    asked by Ching
  169. calculus

    For large values of n, the Riemann sum 1/n(sin0 + (pi/2n) + sin(2pi/2n) +sin(3pi/2n)+...sin((n-1)pi/2n)) is an approximation for which of the following integrals?

    asked by Anonymous
  170. PHYSICS

    An object undergoes simple harmonic motion. During that motion the object needs 1.1 seconds to reach one point of zero velocity from the previous such point. If the distance between those points is 0.3 m, calculate the period.

    asked by Unknown
  171. Physics-Totally lost

    I'm totally lost on this one- the earth is surrounded by an electric field with a strenth of 100 N/C at the surface. Its electric properties are the same as a point charge located at its center. How would the gravatational force and electrical force

    asked by Rafaela
  172. Physics...help please!

    Unlike a ship, an airplane does not use its rudder to turn. It turns by banking its wings: The lift force , perpendicular to the wings, has horizontal component, which provides the centripetal acceleration for the turn, and a vertical component, which

    asked by Cesar
  173. statistics

    the mean and the standard deviation of the wages of 1000 factory workers are $20,600 and $2,400 respectively. if a worker's annual wage is $20,000, find and interpret the worker's sample z-score.

    asked by lisa
  174. math

    the pea data is;2,3,4,5,6 and the frequency is ; 7,9,5,3,1 find the mean, median, mode and midrange number of peas per pod

    asked by rita
  175. chemestry

    true or false the equivalence point is the point at which a neutraliztion reaction has occured

    asked by chyanne
  176. physics

    if you have an element that starts out at 40g and has a half-life of 10 days, you keep it for 30 days- how much doe you end up with? .

    asked by sandy
  177. math

    25 pea pods were broken apart and the number of peas in each pod recorded. The record looked as follows: # peas in pod; 2,3,4,5,6 and frequency; 7,9,5,3,1 Make a histogram for this data, does this data appear to be skewed? What is the model class for this

    asked by Mary
  178. Biology . Ahh , help me with this question please

    summarize how unicellular organisms may have given rise to the first animals ? Please , & thank you(:

    asked by Andrea
  179. algebra

    p(x)=x^3+2x^2-3x+20 one of this functions zeros is -4 When using synthetic division to find all the zeros of a polynomial function, would you plug in 4 or -4 into the actual equation?

    asked by Sarah
  180. physics

    what is 2 meters long or 2 meters high that you can find in a home

    asked by ruth
  181. logarithmic functions

    log(subscript 2)(0.5) I know how to convert it into: 0.5 = 2^(y) but then how do I find y?

    asked by Haley
  182. Chemistry

    The Ka for hydroflouric acid is 4.5 *10^-4 at 298K. Calculate the amount of sold NaF that is required toprepare a 250. mL acidic buffer with pH = 2.75. The inital molarity of hydroflouric acid is .250M but you have only 75mL.

    asked by Jake
  183. geomatry

    two similar plygons have a similarity ratio of 4 to 5 the larger polygon has an area of 700 cm2 what is the area of the smaller polygon

    asked by vanessa
  184. geometry

    the widthe width of a rectangle is 6 inches less than the length. the perimeter is 72 inches. find the lengtj and the width

    asked by Anonymous
  185. English

    1. A Swiss family were pulling spaghetti off trees. 2. A Swiss family were pulling spaghetti from trees. (Which preposition do we have to use, off or from? Are both OK and the same?

    asked by rfvv
  186. chemistry

    whatspecies are present in kcl

    asked by Anonymous
  187. Math

    5 is ___% of 7. a. 714.29 b. 71.43 c. 7.14 d. 0.71 I believe that it looks like that 5=R x 7 R= 5:7 R=0.7142 Is it correct? d ? Thank You

    asked by MaS
  188. calculus

    find the derivative f(x)= e^1/x^2ãx

    asked by Brian
  189. accounting

    Dsoft manufactures PC’s. The company’s Notebook Division reports the following results for the current year: Sales Revenue $2,000,000 Operating Income $500,000 Average Operating Assets $5,000,000 Dsoft’s management’s required rate of return on

    asked by Anonymous
  190. precalc

    Find the equation of the parabola: x^(2)+4x = y-8

    asked by Haley
  191. MATH

    Without writing them all out, what is the number of subsets of set A ={king, queen, knight, prince, princess, duke, earl}?

    asked by Anonymous
  192. social studies 8th grade

    what are the factors of industrial development

    asked by hunt
  193. Dante's Infero/Kwami KiIlpatrick

    So, for a project I'm doing. We're reading dante's inferno right now in English and we got a project to pick any person on the planet and put them in Hell, and to decribe the level they'd be on and why. I'm having trouble picking the Level of Hell to put

    asked by Allyson
  194. Math

    the concentration of a certain substance in our organism is given by the model Q9t) = Q(subscript 0) e^-0.1960t a) what quantity of substance is present in the organism of this individual 3 hours after ingestion? b) after how many hours will there only be

    asked by Ralph
  195. com220

    identify the legislation that you think is linked to the issue

    asked by Anonymous
  196. social studies

    The Calvinists also believed that ? should not control their church,but that the congregation should choose their leaders.

    asked by Jan
  197. 4th grade

    The 93 nature camp students ate lunch at the lodge. They sat at an even number of tables. There were 5 students at one table, and an equal number of students sitting at each of the other tables. How many students were sitting at each of the other tables?

    asked by lille
  198. calculus

    find ds/dt at (2,1) given t6(2)-2ts+s^(2)=s possible choices are -2/3, 2/3, -3/2 or 3/2

    asked by amy
  199. mmh

    wats xsquared-13x+36=0

    asked by lali
  200. nutrtion

    Create a 6-slide Microsoft® PowerPoint® presentation, including speaker notes, tracing the nutrition needs of both a man and a woman throughout the various stages of life. Be sure to address what their nutritional needs are: o As infants o As teenagers o

    asked by rick
  201. Social Studies

    Hi I need some notes on how The Castle is an australian icon. I have tried and tried but my computer is mucking up!

    asked by Yasi
  202. grammar

    Can you say that someone felt as congruent as they felt before?

    asked by alexander
  203. science physics

    describewhat is an importance of microscope to mankind it's urgent please help?

    asked by kennie
  204. 5th grade Math

    Explain how you can find the product of 5 and 3/4.

    asked by Sarah
  205. english

    When should I use a comma in a sentence.

    asked by wendy
  206. math

    A company with 364 employees increases its workforce to 455. What is the percent increases in the workforce?

    asked by Ryan
  207. geometry

    Find the supplement to the angle whose measure is 85 degrees.

    asked by Cynthia
  208. pys202

    Contrast 2 theories or perspectives from the late stage adult development?

    asked by Elley
  209. English

    What are the steps for editing?

    asked by Catherine
  210. biology

    You are gardening and accidentally puncture your arm with a nail that was in the soil. No significant occurred but your arm was swollen. Recall that soil contains many microorganisms that could be pathogenic. Describe in detail the nonspecific and specific

    asked by stella
  211. science

    Why isn't heat matter

    asked by Mckey
  212. chemistry

    Hello! Can someone please tell me if I am wrong here? For a reaction where rate = k (A)(B)^2, what factor will NOT change k? a) raising the temperature b) increasing concentration of A c) adding a catalyst d) none of these e) lowering the temperature -- I

    asked by polkadot
  213. Trigonometry

    If 13 sin x + 5= 0 and x є (0º; 270º) calculate the sum of 2x

    asked by Michelle
  214. chemistry

    Can someone please explain how to do this question? A 0.057M solution of a weak acid has a pH of 4.93. Determine the ionization constant, Ka, of the acid. a) 2.1 x 10^-4 b) 2.4 x 10^-9 c) 4.1 x 10^-8 d) 2.8 x 10^-7 e) 1.4 x 10^-10 -- Well, to be honest, I

    asked by polkadot
  215. health, safety and nutrition

    Following the nutritional label on a jar of peanut butter, you determine that 1 ounce of the peanut butter contains 115 calories and 9 grams of fat. what percent of the calories come from that?

    asked by reann
  216. English

    1. A Swiss family in the country were pulling spaghetti off trees. 2. A Swiss family in the country were pulling spaghetti from trees. (Can we use 'from' instead of 'off'? Are both sentences the same? What is the part of speech of 'Swiss' in the sentences?

    asked by rfvv
  217. Precal grade 11

    If 3 is one root of 2x^2 + bx + 3 =0 find the other root and the value of b. The answers are r2=1/2 and b=-7 but i don't know how to get those.

    asked by Anonymous
  218. Language 7

    Rewrite the sentences below so that the pronouns match the correct nouns, or change the pronoun so that it matches the right noun or nouns. a) She took the sweater out of the drawer and wrapped it up. b) The ball slowly rolled into the net, but it was

    asked by Curly Sue
  219. english

    When should I use a comma in a sentence.

    asked by wendy
  220. English

    1. The penguins from King George Island flew (for) thousands of miles to South America to spend the winter. (Is 'for' missing before thousands of miles?)

    asked by rfvv
  221. English

    Describe something that has been carefully observed. A flower please.

    asked by Rose
  222. Language 7

    At one time, he, him, and his were used to represent individuals of either gender, but this practice is no longer acceptable. change the pronouns in these sentences so that both ales and females are represented. a) No one has to stay in his seat after the

    asked by Curly Sue
  223. Economics

    Why is it important for the government to regulate the activities of natural monopolies? Can you name 2 restrictive practices carried out by a company?

    asked by Hannah
  224. introduction to accounting

    a merchandising company wants to include the cost of operating its warehouse in the cost of inventory. The company’s controller argues that the cost of the warehouse is a reasonable and necessary cost of getting the inventory ready for sale and,

    asked by sandra
  225. 4th grade math

    marco:87 bridget:95 erin:93 jinwon:910 david:94 describe how a bar graph could illustrate the test scores.

    asked by megajolt
  226. calculus

    Let f (x) = 5 - x/2. What is the value of the Riemann sum R(f ,0,8), obtained by using four rectangles and left-hand endpoints?

    asked by Anonymous
  227. Chenistry

    If 1.55g of ptassiumhydroxide is dissolved in 20ml of water, what is the expected temperature change for water?

    asked by Anonymous
  228. calculus

    The approximation to the area under the graph of the function f(x)= 1/(1+x^2) on the interval [-1,1], using four rectangles and the midpoint rule is

    asked by Anonymous
  229. statistics

    Compute the standard error of the estimate for the data below. X values 3 –2 2 5 10 Y values 4 6 –2 0 –3

    asked by b
  230. childcare

    6. You've developed a file in which you keep pictures of different colored birds. One day you give the group of pictures to a preschooler and ask him to separate the pictures by color-all red birds in one pile, all blue birds in another pile, and so on. He

    asked by Heather
  231. childcare

    7. Questions 7-10 are based on the following scenario: Carlos is playing in the sandbox. Thomas approaches the sandbox, observes Carlos for a moment, then knocks over the bucket Carlos has just filled with sand. Carlos pushes Thomas away saying, "Get out

    asked by Heather
  232. childcare

    An appropriate science activity for an infant would be A. weighing and measuring other infants. B. planting a flower. C. feeling different textured objects. D. caring for pets of the facility.

    asked by Heather
  233. childcare

    An inappropriate science activity for a toddler would be A. reporting on the weather. B. caring for pets of the facility. C. planting a flower. D. watching a science show on TV.

    asked by Heather
  234. childcare

    Children with special needs should A. be directed to lower age-level activities. B. have little interaction with others. C. be directed to appropriate age-level and developmental activities. D. have stricter discipline.

    asked by Heather
  235. vocabulary

    the greek base ANGI- means: a)gland b)vessel c)bile D)head

    asked by amy
  236. childcare

    14. Caregivers shouldn't allow dress-up play with hats when _______ is/are a problem. A. cradle cap B. dandruff C. lice D. psoriasis

    asked by Heather
  237. childcare

    When working with special needs/learning disabled children, caregivers should A. provide positive role models for them. B. ignore their disabilities. C. try to do as much as possible for them. D. instruct other children to disregard them.

    asked by Heather
  238. science

    what does the "lac" repressor bind to? lac is in italic

    asked by Bella
  239. math

    cesar bought 2 bags of flower that each weighed a kilogram and another bag that weighed 500 grams.how many grams of flower did he buy?

    asked by Caitlin
  240. math

    Katie is on the 15th floor of a building. She throws a ball straight down from the window, which is 220 feet above the ground. How fast must she throw the ball(in feet per second) for it to hit the ground in 3 seconds?

    asked by diana
  241. Physics Urgent!!

    A day on Mars is 24.6 Earth hours long. A year on Mars is 687 Earth days long. How do the angular velocities of Mars’ rotation and orbit compare to the angular velocities of Earth’s rotation and orbit? w(M)/w(E)= and w(My)/w(Ey)= w is what I used to

    asked by Roberto
  242. Earth Science

    Compare the general temperature and direction of flow of the current that flows off the east coast of the United States with the temperature and direction of flow of the current that flows off the west coast of the United States.

    asked by Danielle
  243. geometry

    Is it possible to construct a triangle using segment lengths of 5, 8, and 2?

    asked by Anonymous
  244. math

    From the information given here, determine the 95% confidence interval estimate of the population mean.

    asked by Anonymous
  245. poetry

    Help with a format to write an essay, in general. Thanks selena

    asked by Anonymous
  246. math

    A square has symmetry with respect to a line containing a median of the square. True False true?

    asked by danny
  247. social studies

    The guild system of the Middle ages is analogous to what current-day organization? A. royal family B. a craft(labor) union C. a farmer's co-op D. a political party

    asked by Rebecca
  248. statistics

    Suppose that M and S are two events such that; P(S)=4/32, P(MnS)==3/32 and P(MuS) = 25/32. evaluate P(M)

    asked by lisa
  249. Safety

    Hi for my safety class I have to do a powerpoint about the risk and hazards in recreational indoor activities. I'm having trouble locating websites about this topic. Any help would be appreciated, thanks!

    asked by Jon
  250. math

    I need help on finding the median for 17,11,13,18,13,21.

    asked by mya
  251. English

    What services are available to young people living on their own that would enable them to get by earning less money I don't understand.

    asked by Anonymous
  252. Physics

    If the expression for a given vector is Vector A-Vector B=(4-5)i^+(3+2)j^ and the magnitude of the difference of the vector is equal to 5.1. What is the direction of the difference Vector A - Vector B. (in the counterclockwise and +x direction)

    asked by Allison
  253. social studies

    The Magna Carta did which of the following? A. ended the institution of slavery in Europe B. provided all British males the right to vote C. strengthened the british monarch D. lessened the kings power with respect to aristocracy I think its d.

    asked by Rebecca
  254. social studies

    The samurai of Japan were analogous to what European class of people? A. serfs B. slaves C. nobility D. monarchs I think the answer is c.

    asked by Rebecca
  255. social studies

    which of the following best accounts for the success of the african empires in the 10th through 15th centuries? A. location on the silk road trade route B. the christianization of that area C. the presence of gold and precious metals D. technological and

    asked by Rebecca
  256. geometry

    IN this triangle, R=8ã2 what is the value of P

    asked by Virginia
  257. math

    The weekly take-home pay (in dollars) for 20 graduate teaching assistants at University Z is as follows: 500.75,217.43,488.25,405.78 485.46,495.48,370.75,435.40 479.65,482.56,470.28,489.90 382.50,500.75,465.32,481.25 506.43,225.50,504.38,179.25 Find the

    asked by chris
  258. english

    find the subject and the predicate in these sentences?????????? 1.There is large envelope on the table. 2.Lend me your dictionary.

    asked by madhur
  259. calculus

    suppose a price-demand function p(x) is defined implicitly by x= p^3-3p^2+200 find p'.

    asked by kelly
  260. Math 7th

    In order to be allowed to go on a does trip, 80% of the students in a class must pads a pop quiz. If there are 26 students in the class. Approximately how many must pass the quiz?

    asked by Caitlin
  261. statistics

    Suppose that A,B and C are mutually exclusively events such that; P(A) =0.3, P(B)=0.1, and P(C)=0.5. Evaluate; P(AuBuC)

    asked by Liza
  262. chemistry

    i start with 10 g of zinc. I have 12.5 mass of oxide formed. How the reaction will increase

    asked by Anonymous
  263. Math 7th

    In order to be allowed to go on a does trip, 80% of the students in a class must pads a pop quiz. If there are 26 students in the class. Approximately how many must pass the quiz?

    asked by Caitlin
  264. math

    2) A ball is hit at an angle of 36 degrees to the horizontal from 14 feet above the ground. If it hits the ground 26 feet away (in horizontal distance), what was the initial velocity? Assume there is no air resistance.

    asked by arun
  265. social studies

    What are a few early motions towards the abolition of slavery

    asked by emily
  266. Goverment

    I have a question about my homework. Alright here it is........................ I live in Downingtown Pennsylvania My question is who runs the municipal goverment? Hope u can answer it!:)

    asked by Olivia
  267. Math

    What is the perimeter of a rhombus with sides each 9 inches long?

    asked by DestinyLashea
  268. calculus

    what is the integral of [e^(11x)]/[e^(11x)+8]

    asked by rachel
  269. gen chemistry

    How mucn 0.6 M barium chloride solution would be needed to completely react with 150mL of a 1.4 M sodium solution

    asked by drea
  270. calculus

    how do you set up the volume of the region bounded by y=x and y=x^2 rotated about the line y=3.

    asked by jazmine
  271. trig

    find the period and amplitude of each sine function.then sketch each function from 0 to 2pi: 1)y=-3.5 sin 5theta

    asked by Anonymous
  272. statistics

    Approximately how many research participants would be required for 80% power for a study using the t test for dependent means (assume a one-tailed hypothesis with an expected medium effect size of .50):

    asked by Anonymous
  273. math

    The Fred Hartman Bridge allows Texas State Road 146 to cross the Houston ship channel. The bridge is 0.237 mile long. How many feet long is the bridge?

    asked by kierra
  274. sociology

    Is this statement correct as a social structure? Based on the Durkheim’s theory of social structure, this best matches who I am as a person and as part of a group. According to Durkheim’s theory, my social structure is based on the groups that one

    asked by Sharon