Questions Asked on
April 24, 2011

  1. Chemistry

    A 32.5g cube of aluminum initially at 45.8 C is submerged into 105.3g water at 15.4 C. What is the final temp of both substances at thermal equilibrium. Assume the al and the H2O are thermally isolated from everything else) Specific heat cap Al= .903

    asked by Phillip
  2. Chemistry

    Consider the following reaction occurring at 298K BaCO3(s)-> BaO(s) + CO2 (g) show that the reaction is not spontaneous under standard condition by calculating delta G rxn. I calculated delta G and got 219.7 kJ, now the question asks if BaCO3 is placed in

    asked by Trista Nigh
  3. Chemistry

    One of the main components of hard water is CaCO3. When hard water evaporates, some of the CaCO3 is left behind as a white mineral deposit. If hard water solution is saturated with calcium carbonate, what volume of the solution has to evaporate to deposite

    asked by Trista Nigh
  4. college chem

    The cation M2+ reacts with NH3 to form a series of complex ions as follows: M2+ + NH3 M(NH3)2+ K1 = 102 M(NH3)2+ + NH3 M(NH3)2 2+ K2 = 103 M(NH3)2 2+ + NH3 M(NH3)3 2+ K3 = 102 A 1.0 × 10–3 mol sample of M(NO3)2 is added to 1.0 L of 15.0 M NH3 (Kb = 1.8

    asked by richard
  5. Algebra

    Sam invested $1950 part of it at 6% and the rest at 8% yearly interest. The yearly income on the 8% invest was 6$ more then twice the income from the 6% investment. how much did he invest at each rate

    asked by Jacob
  6. Probability as a Fraction

    In a bag there are 7 red tiles, 3 blue tiles, and 2 purple tiles. How many and what color tiles would you have to add to the bag so that the probability of picking red is 1/3?

    asked by Jeffrey
  7. physics

    A cube of ice is take from the freezer at -8.5C and placed in a 95g calorimeter aluminum cup containing 310g of water at 20degC. The final situation is observed to be all water at 17degC. What was the mass of the ice cube?

    asked by Mark
  8. physics

    A clock with a pendulum made of steel has a period of 1.000 s at 20.0°C. The temperature is decreased to 4°C. By how much does the period change? How much time does the clock gain or lose in one week?

    asked by kia
  9. physics

    Two identical wooden barrels are fitted with long pipes extending out their tops. The pipe on the first barrell is 1 foot in diameter, an the pipe on the second barrell is only 1/2 inch in diameter. When the larger ptpe is fill with water to a height of 20

    asked by Loui
  10. physics

    1. The physics of Mars and its two moons. Mars has two moons, Phobos and Deimos (Fear and Panic, the companions of Mars, the god of war). Deimos has a period of 30 h, 18 min and a mean distance from the centre of Mars of 2.3 x 104 km. If the period of

    asked by aly
  11. physics

    Given that 12g of carbon combines completely with 16g of oxygen to form carbon monoxide, how many grams of carbon monoxide can be made from 48g of carbon and 48g of oxygen

    asked by Abbie
  12. english

    tennyson's "the lady of shalott has a rhythm and a rhyme pattern that make it sound like a. a sonnet b. an elegy c. a nursery rhyme d. an ode

    asked by S.S.
  13. physics

    A roller coaster of mass 1000.0 kg passes point A with a speed of 1.80 m/s? point a= 30m point b= 0m point c= 25m point d= 12m 1. What is the total mechanical energy of the roller coaster at point A? 2. What is the speed of the roller coaster at point B?

    asked by aly
  14. physics

    The physics of orbital radius and orbital period of a planet. If a small planet were discovered whose orbital period was twice that of Earth, how many times farther from the sun would this planet be?

    asked by aly
  15. Chemistry

    A nitric acid solution is found to have a pH of 2.70. Determine [H3O+],[OH-], and the number of moles of HNO3 required to make 5.50L of the solution.

    asked by Jessica
  16. consumer mathematics

    a sofa sells for $840. the sale price is $714., find the percent of decrease of the sale price from the regular price

    asked by marlo
  17. physics

    Oxygen molecules contain two oxygen atoms, and carbon dioxide molecules contain one atom of carbon and two atoms of oxygen. How does the total number of molecules in 1 liter of oxygen compare with the total number of atoms in 1 liter of carbon dioxide if

    asked by Loui
  18. Physics

    A radiation worker is subject to a dose of 150 mrad/h of protons for one 40 h work week. How many times the yearly allowable effective dose did she receive?

    asked by Leigh
  19. Chemistry

    How many moles of HCl must be added to 100mL of a 0.100 M solution of methylamine (pKb=3.36) to give a buffer having a pH of 10.0?

    asked by Joe
  20. Chemistry

    In this experiment the only source of Ca2+ ions is Ca(OH)2. Using the experimental Ksp value, calculate the slubility of Ca(OH)2 (in mol/L) in .30 M NaOH. Experiment Ksp = 1.69x10^-5

    asked by Jose
  21. Chemistry

    What mass of the following solution contains 0.100 mol of solute? 0.334 molality NH4NO3

    asked by Anonymous
  22. physics

    A woman with a mass of 65kg climbs a set of stairs that are 3m high. How much gravitational potential energy does she gain? Thank you.

    asked by Loui
  23. ap chemistry

    Arrange the following 0.10 M solutions in order of increasing H+ : HClO4 , H2SO4, NH4Br , KCN, KBr, KOH

    asked by stephen
  24. physics

    The physics of satellite motion around Jupiter. A satellite of mass 2.00 x 104 kg is placed in orbit 6.00 x 105 m above the surface of Jupiter. Please refer to the data table for planetary motion included in this lesson. a) Determine the force of

    asked by aly
  25. physics

    The physics of a golf ball and kinetic energy. When a 0.045 kg golf ball takes off after being hit, its speed is 41 m/s. a) What is the kinetic energy of the ball after it has been hit? b) How much work is done on the ball by the club? c) Assume that the

    asked by aly
  26. physics

    If an 80kg sprinter can accelerate from a standing start to a speed of 10 m/s in 3s, what average power is generated

    asked by Loui
  27. simplex Method

    Solve the linear programming problem by the simplex method. Maximize P = 5x + 4y subject to 3x + 5y < 78 4x + y < 36 x > 0, y > 0 x = y = P =

    asked by Leah
  28. social studies

    Why do you think the cities of Judaea were all important centers of Christianity? Because they were places where important times in Jesus' life occurred. Do you think this is the answer my teacher is looking for??

    asked by Reed
  29. Simplex Method

    Solve the linear programming problem by the simplex method. Maximize P = 10x + 6y subject to x + y < 80 3x < 90 x > 0, y > 0 x = y = P =

    asked by Leah
  30. PRECALCULUS

    1.) determine two pairs of polar coordinates for the point (-4sqrt3, 4sqrt3)with 0degrees less than or equal to theta less than or equal to 360degrees 2.) Use DeMoivre's Theorem to find (1-i)^10. write your answer in the form a+bi. 3.) Find the cube roots

    asked by YOSHI
  31. Microeconomics

    Search: Consider two resource markets in which the demand curves slope downward. In market A, the supply curve is horizontal, equilibrium price is $6, and 100 units of the resource are hired. In market B, the supply curve is vertical, equilibrium price is

    asked by Elizabeth
  32. social studies

    By a.d. 325, Christianity had spread to which continents? Northern Africa, Southern Europe and Western Asia. Is my answer correct?

    asked by Reed
  33. geometry

    Triangle PQR has vertices P(1,2), Q(25,2) and R(10,20). Find the coordinates of the centroid. Find the coordinates of the circumcenter. Find the coordinates of the orthocenter. Find the equation of the line.

    asked by Ginny
  34. simplex Method

    A company manufactures two products, A and B, on two machines, I and II. It has been determined that the company will realize a profit of $3/unit of product A and a profit of $4/unit of product B. To manufacture 1 unit of product A requires 6 min on

    asked by Leah
  35. algebra

    Melinda invested three times as much money at 9% yearly interest as she did at 7%. her total yearly interest from the two investments was 170$ How much did she invest at each rate Thanks !!

    asked by Jacob
  36. chemistry

    At a certain temperature, 514, Kp for the reaction, Cl2(g) + Br2(g) 2 BrCl(g), is 6.98 x 107. Calculate the value of DGo in kJ for the reaction at 514 K.

    asked by sam
  37. Simplex Method

    Solve the linear programming problem by the simplex method. Maximize P = 27x + 27y + 36z subject to x + y + 3z < 15 4x + 4y + 3z < 65 x > 0, y > 0, z > 0 x + y = z = P =

    asked by Leah
  38. chem

    Arrange the following 0.10 M solutions in order of increasing H+ : HClO4 , H2SO4, NH4Br , KCN, KBr, KOH

    asked by Kely
  39. Physics

    A 20 cm long, 180g rod is pivoted at one end. A 17g ball of clay is stuck on the other end. What is the period if the rod and clay swing as a pendulum?

    asked by Dan
  40. math

    Im stuck on this question. Could someone answer it. Id appreciate it. The projected rate of increase in enrollment at a new college is estimated by: dE/dt = 9000(t + 1)^-3/2 where E(t) is the projected enrollment in t years. If the enrollment is 5000 now

    asked by JL
  41. calculus

    A street light is at the top of a 19 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 5 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 40 ft from the base of the pole? Rate =

    asked by saud
  42. English

    Can someone give me some feedback on this compare and contrast essay that I have completed. Into day’s society, online social networking has provided a variety of advantages and disadvantages. The use of today’s technology results in an alternative to

    asked by Cherrel
  43. physics

    The physics of gravity and satellite motion around Jupiter. A satellite of mass 2.00 x 104 kg is placed in orbit around Jupiter. The mass of Jupiter is 1.90 x 1027 kg. The distance between the satellite and the centre of Jupiter is 7.24 x 107 m. a)

    asked by aly
  44. Physics (please help!!!!)

    A Foucault pendulum is designed to demonstrate the effect of the Earth's rotation. A Foucault pendulum displayed in a museum is typically quite long, making the effect easier to see. Consider a Foucault pendulum of length 16 m with a 109-kg brass bob. It

    asked by Hard to solve ..please help!!!!
  45. Psychology

    Can anyone think of another example of a Personological variable other than just personality? I'm looking at the General Aggression Model (the long term one) and it says an increase in agressive personality leads to Personological variables (e.g.

    asked by Emily
  46. British Lit.

    Explain hoW Percy Bysshe Shelley relates the skylark's song to his own efforts to write poetry in "To a Skylark."

    asked by S.S.
  47. Physics

    A garden hose with a diameter of 0.65 has water flowing in it with a speed of 0.91 and a pressure of 1.2 atmospheres. At the end of the hose is a nozzle with a diameter of 0.29. Find the speed of water in the nozzle? Find the pressure in the nozzle.

    asked by URGENT PHYSICS HELP!
  48. Chemistry

    What is the mole fraction of benzene C6H6 in the VAPOR PHASE from a solution consisting of a mixture of benzene and n-hexame ch3(ch2)4ch3 at 27celsius, if the total pressure above the solution is 135.2 torr? The vapor pressures of benzene and n-hexame at

    asked by Jude
  49. statistics

    the birth of healthy, full term infants in the United States is nearly normally distributed. The mean weight is 3,500 grams, and the standard deeviation is 500 grams. (a) what percentage of the healthy newborns will weigh more than 3,250 grams? (b) what

    asked by ryee
  50. physics

    What is the acceleration due to gravity 100km above the surface of the Earth? (Average radius of Earth is, Re=6.4x10^3km)

    asked by David
  51. Comparative Essay

    I need help on a camparative essay between Barbie Doll and Phenomenal Woman and I would like to include Mirrors. In Barbie Doll society will dictate to us about body image, In phenomenal woman she is confident and is telling society how good she looks and

    asked by Evelyn
  52. Physics

    A 74.5 kg ice skater moving to the right with a velocity of 2.62 m/s throws a 0.21 kg snowball to the right with a velocity of 23.8 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction

    asked by Elizabeth
  53. biology

    To ensure that the mother will have mature egg cells available for in vitro fertiliazation, she must be treated with chemicals that regulate her reproductive cycle. identify these chemicals tha tregulate the female reproductive cycle. Please help me

    asked by alexis
  54. chem

    what is the molarity of iodine ions in a 100 mL solution containing 2.50g of MgI2?

    asked by tracy
  55. Probability

    In a 1970’s game show, a contestant was given a choice of three doors of which one contained a prize. The other two doors contained gag gifts like a chicken or a donkey. After the contestant chose an initial door, the host of the show then revealed an

    asked by Lisa
  56. science

    i have a sciencs fair coming and i don't know what to do please help it has to do with eather plants,prisipatation or i cant remember.

    asked by kool kid
  57. Physics

    A 395cm oscillator has a speed of 104.5cm/s when its displacement is 2.80cm and 74.5cm/s when its displacement is 6.60cm. What is the oscillator's maximum speed?

    asked by Dan
  58. General Biology

    Genetic Inheritance Exercise 1: F1 Hybrid Cross Results: Punnett Square for F1 Cross ¡V Expected Genetic Outcomes F1 Parent, genes: _________ (student to fill in the blanks) ¡ð alleles > ¡ñ alleles v F1 Parent, genes:__________ (student fill in blank)

    asked by Stumped
  59. College Chemistry

    Determine how many grams of water can be produced from excess propane C3H8 and 2.55g oxygen? MM 02 = 32 and MM H2O = 18.2. I tried 2.5 gm O2 X 5 mole O2/32.00 gm O2 x 4 mole H2O/5 mole O2 = 1.40. This is close but not correct. The answer is 1.15. Can you

    asked by Robyn
  60. algebra

    Part $30000 is invested at 6% another part at 7% and the remainder at 8% yearly interest the total yearly income from the 3 investments is $2200

    asked by Jacob
  61. Chemistry

    What mass of the following solution contains 0.100 mol of solute? 0.334 molality NH4NO3

    asked by Anonymous
  62. chemistry

    If in August 1911 Mme. Curie prepared an international standard containing 20.00 mg of RaCl2, what will the radium content of this standard be in August 2010?

    asked by Massiel
  63. Social Studies

    Why do you think the ideas of Marxism were mostly not realized in the actual experiences of socialist countries?

    asked by Jon
  64. Finance

    Assume a $4,000 investment and the following cash flows for two alternatives. Year Investment X Investment Y 1 $1,000 $1,300 2 800 2,800 3 700 100 4 1,900 5 2,000 a. Under the payback method, which investment should be chosen? (Show your

    asked by PLewis
  65. chemistry

    How can precipitates be dissolved? never? by adding constituent ions to the solution? by complexing one of the constituent ions in a soluble form?

    asked by stephen
  66. Physics

    Let us assume that the muon production happens at an altitude of about 15 kilometers above the surface of the Earth, and that the produced muons have a velocity of 0.99 c. Thus, in the Earth system, it takes the muon approx. 50500 nanoseconds to reach the

    asked by Tisha
  67. statistics

    At a neighboring university, the average salary is also $45,000 and the distribution is normal. If $47,000 has a z score of 1.5, what is the standard deviation?

    asked by maria
  68. Computer

    12. Enter the following Marks for Assignment One figures: Name Assgn 1 John 10 Mary 12 Emma 15 Pita 15 Avi 15 Ramu 10 Sani 11 13. Due to a recent natural disaster, MAF11 students were unable to submit their assignments 2 and 3. The Course Coordinator then

    asked by Shinal
  69. Bristish Lit.

    Discuss the Symbolism William Blake used in his poems "The Lamb" and "The Tyger."

    asked by S.S.
  70. University of Phonenix

    Disputes that arise when one person has registered a domain name that is an existing trademark or company name are settled by the

    asked by Susan
  71. Math

    f(x)=(x^3-27)/(x^2-3x) I need to find the slant. If the vertical asymptotes is x=0 then is the slant y=x+3?

    asked by Suzanne
  72. statistics

    A professor knows that in her class 37% of the students have passed an Algebra course, 29% have passed an English course, and 21% have passed both courses. If one student is selected at random from this class, find the probability that: c) the student did

    asked by Confused
  73. Math

    If a pro basketball player has a vertical leap of about 35 inches, what is his hang time? Use the hang-time function V = 48T²

    asked by Julie
  74. physics

    A .095kg aluminum sphere is dropped rom the roof of a 45m building.If 65% of the thermal energy produced when the sphere hits the ground is absorbed by the sphere, what is its temperature change?

    asked by Mark
  75. calculus

    I am learning derivatives and I despise having to use the definition of the derivative. Please check my answer for this particular one! it is different from the one I get by differentiating. The question: f(x) = 2+x / x^3 my answer: -6x^2-2x^2

    asked by dylan
  76. AP Statistics

    Viruses are infectious agents that often cause diseases in plants. Different viruses have different potency levels, and this fact can be used to detect whether a new virus is infecting plants in the field. In a potency comparison experiment, two viruses

    asked by Stephanie
  77. english grammar

    pls.check my english grammar if it is correct usage. i remeber when i was at my young age i was always doing all the i could.

    asked by jessie
  78. Chemistry

    Magnesium is found in the ore,magnesite, MgCO3. The ore decomposes when heated to form magnesium oxide and carbon dioxide. Write the balanced equation for this reaction.

    asked by Tom
  79. physics

    What is the mass of a lead sinker witha volume of 3cm3? please show work Thank you

    asked by Loui
  80. Pharmacist information

    Pharmacists who are trained in the United States must earn a Pharm.D. degree from an accredited college or school of pharmacy. The Pharm.D. degree has replaced the Bachelor of Pharmacy degree, which is no longer being awarded. To be admitted to a Pharm.D.

    asked by Anonymous
  81. spanish

    How do I say "sue me" in spanish?

    asked by nelson
  82. english

    which of the following poems is a dramatic monologue? a. my last duchess b. love among the ruins c. childe roland to the dark tower came d. all of these

    asked by S.S.
  83. differential equation

    Find the Laplace transform by using the theorem of L{f(t-a)H(t-a)}=(e^-as)F(s) L{(e^4t)H(t-10)}

    asked by farook
  84. Business

    Where does personal responsibility end and corporate responsibility begin? How does your response change across specific industries? What role (if any) do you believe the government should play? Develop a rationale for each of your answers.

    asked by TM
  85. Calculus

    sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region. 2y=5 rootx, y=5, and 2y+2x=7.

    asked by Amy
  86. Physics (please help!!!!)

    The mass m = 14 kg shown in the figure is displaced a distance x to the right from its equilibrium position. (Take k1 = 113 N/m and k2 = 198 N/m.) (a) What is the net force acting on the mass? (Use any variable or symbol stated above along with the

    asked by HELP!
  87. Chemistry lab

    I did a copper cycle lab and my final weight of the copper is less than what i started with. Where did the lost copper go?

    asked by Lindy
  88. chemistry

    The atomic mass of iron oxide is 160 atomic mass units. What is the atomic mass of iron if a molecule of iron oxide consists of tow atoms of iron and three atoms of oxgen?

    asked by Abbie
  89. physics

    It is possible to cut the top off a alcohol-in-glass thermometer without any of the alcohol spilling out. However, it will no longer function as a good thermometer. Why not. I am thinking it is a lost pressures issue.

    asked by Abbie
  90. trig

    find, to the nearest tenth of an inch, the length of the arc intercepted by a central angle of (4pi)/3 radians if a radius of the circle is 22 inches long

    asked by Scott
  91. trig

    find, to the nearest tenth of a meter, the length of the arc intercepted by a central angle of 160 degrees if a radius of the circle in 8 meters long

    asked by Scott
  92. AP Chemistry

    A 2.5 gram sample of a hydrocarbon containing C, H, N, O is combusted in excess oxygen. The nitrogen compounds that are formed are treated to convert all of N to N2. The gases are passed through a CaCl2 drying tube which weighs 1.00 gram initially and 3.16

    asked by Kim
  93. Physics

    A railroad car with a mass of 1.93 104 kg moving at 3.24 m/s joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.16 m/s. (a) What is the speed of the three joined

    asked by Elizabeth
  94. physics

    You can apply enough force to the head of a pushpin to push it into a plaster wall with your thumb. However, it is not a good idea to try to do this with a needle. Use the concept of pressure to explain the differnce betweeen these two situations. Thank

    asked by Loui
  95. layla

    Mrs. Baker has to choose 2 students to lead the class field trip. If she draws from a list of 6 boys and 6 girls, what is the probability that 2 girls will be drawn? (Please Help!) A.1/7 B.5/24 C.5/22 D.5/6

    asked by math
  96. com/156

    Read the essay and write a paragraph of at least 200 words in which you discuss how effectively the author persuaded you.

    asked by Pooh
  97. Chemistry

    Use Hess' Law to calculate the heat of the following equation. Show all work including the reactions that you use, in the form that you use them. 2 C + 2 NO2 ---> 2 CO 2 + N 2

    asked by Kat
  98. Maths

    Hey! Okay so when the weather reporters say that ?mm of rain fell over night, they're talking about mm cubed aren't they? So while I was working out what to cube root to find out the ?mm of rain that fell overnight, I called it Rainfall mm. So what could I

    asked by Ella
  99. US History

    How did the US become involved in the politics of Southeast Asia?

    asked by Kelsey
  100. Chemistry

    The vapor pressure of pure water at 90celsius is normally 525.8 but decreased 483mmHg upon addition of an unknown amount of KNO3 to 286.9g H2O at this temperature. how many grams KNO3 were added. ASSUME COMPLETE DISSOCIATION OF SOLUTE. Tried all solutions

    asked by Jude
  101. Maths

    So if I'm using the area 8558.25 in that math I need to have it as 8558.25squared and then sqaure root it?

    asked by Tatiana
  102. Geology/Mineralogy

    Hope some experts can help me answer the question below~ really need for the help ~~ thanks so much^^ My question: I am studying a polished cross-sectional piece of an igneous rock under the SEM. How do I determine which phases/compounds crystallize first

    asked by Sindy Yap
  103. Related Occupations

    Could I know of some related occupations to a Pharmacist?

    asked by Anonymous
  104. physics

    Two wires run parallel to each other with currents I1 = -60.3 A, and I2 = 44.1 A. If they are a = 0.12 m apart, what is the magnitude of the force (N) per meter of length? I used the formula (f/L)=Uo(I1)(I2)/(2(pi)(r)) I got 4.43810^-2(N/m)but it was

    asked by Ana
  105. algebra 1

    In the standard (x,y)cooridniate plane the graph of (x-2)second power +(y+4 second power =9 is a circle. What is the area enclosed by this circle, expressed in sguare coordinate units? please help me?

    asked by elodie
  106. physics

    What is the mass of a lead sinker witha volume of 3cm3? please show work I calculated 11.3*3 = 33.9 Is this correct.. Thank you.

    asked by Loui
  107. math

    Evaluate the polynomial for x = -2. Simplify your answer 3x² - 2x +2

    asked by Mary
  108. math

    Jack usually mows his lawn in 4 hours. Marilyn can mow the same in 5 hours. How much time would it take for them to mow the lawn together?

    asked by Mary
  109. math

    Find the vertex, the line of symmetry, and the maximum or minimum value of f(x). Graph the function. F(x) = 1/8 (x + 9)² +3

    asked by Juan
  110. arabic

    how do i know when to use: meem heh meem wow heh meem alaf heh meem in a sentence? Is there a "trick"?

    asked by miya
  111. physics

    The physics of energy and Earth's moon as a satellite. The moon is an Earth satellite of mass 7.35 x 10^22 kg, whose average distance from the centre of Earth is 3.85 x 10^8 m. a) What is the gravitational potential energy of the moon with respect to

    asked by aly
  112. Chemistry

    The total pressure in a flask containing air and ethanol at 257C is 878 mm Hg. The pressure of the air in the flask at 257C is 762 mm Hg. If the flask is immersed in a water bath at 450C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at

    asked by CHEMHELP..BOB
  113. Chemistry

    The total pressure in a flask containing air and ethanol at 257C is 878 mm Hg. The pressure of the air in the flask at 257C is 762 mm Hg. If the flask is immersed in a water bath at 450C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at

    asked by CHEMHELP..BOB
  114. algebra

    While vacationing,john has dinner at a restaurant in Japan and his tab comes to 3,428 yen. The exchange rate at the time of his visit is 1 yen = 1.25 cents. What was the cost of the meal in US dollars??

    asked by mike...
  115. math

    A professor knows that in her class 37% of the students have passed an Algebra course, 29% have passed an English course, and 21% have passed both courses. If one student is selected at random from this class, find the probability that:

    asked by Confused
  116. writing

    What does the (n.d.) stand for in the following sample citation: GovTrack. (n.d.). Brian Higgins U.S. Representative, New York’s 27th District

    asked by Anonymous
  117. physics

    a cetrifical force of 98N is acted upon a 5kg. ciculating object. If the object is moving at a radius of 1.2m ,what speed is needed to keep it in the cicular motion?

    asked by David
  118. physics

    A ball is thown at 20m/s at an angle of 30 degrees from the horizontal level. What maximum height can the ball reach?

    asked by David
  119. Earth Science

    This is the raw data we got from the river: The mins it took the tongue depressor to float from point a to b and the depth of the river on those days. Using area x velocity, I need to calculate the discharge results for the following dates: April 4 2:52

    asked by George
  120. English

    As an English teacher where would i go in ENgland and Why??

    asked by marina
  121. Chemistry

    The total pressure in a flask containing air and ethanol at 25.7C is 878 mm Hg. The pressure of the air in the flask at 25.7C is 762 mm Hg. If the flask is immersed in a water bath at 38.8C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at

    asked by Deanna
  122. Surveys/Geography

    Do you think this is a good survey or should I change the wording and/or add questions? ******* Have you heard of the movie ‘The Castle’? Have you seen the movie ‘The Castle’? Do you believe that this movie is an accurate portrayal of Australian

    asked by Harriet
  123. calculus

    I posted one before but this is another one of those problems that i need help with! I don't know how to approach this one at all! Please help use the definition of the derivative to find f'(x) when f(x)= (4/x^2)+(2/5*x)

    asked by dylan
  124. physics

    One of the moons of Jupiter is Io. The distance between the centre of Jupiter and the centre of Io is 4.22 x 10^8 m. If the force of gravitational attraction between Io and Jupiter is 6.35 x 10^22 N, what must be the mass of Io?

    asked by aly
  125. Chemistry

    Several years ago a company invented plastic ice cubes. These were colored plastic cubes with frozen water (or another substances) inside. That way, as the solid melted, it could cool your drink, but did not dilute it with extra water (from the melted

    asked by Kat
  126. Speechwriting

    Hiya! Okay how can I introduce a speech without saying Goodmorning ladies and gentlemen? But not seem rude?

    asked by Maya
  127. Math

    Explain how factoring is used to solve quadratic equations. Demonstrate the process with an example.

    asked by Opera
  128. science 8th grade

    what will happen if a metal block that is 60°c is placed in water that is 20°c?

    asked by Antoinette-Hope
  129. Religion and Spirituality

    What do you think is the moral of the story Tao of Forgiveness? Thank you :)

    asked by Rachel
  130. English

    I forgot to include these other sentences. As they are instructions, I'm not sure whether it is possible to use "you have to.., you'll have to". Thank you. 1) Go through passport control.There an official checks (will check?) your passport.All things (or

    asked by Henry1
  131. physics

    With density g/cm3 copper 8.93 silver 10.5 mercury 13.6 will a block of copper or silver float higher in mercury in liquid form? Thank you.

    asked by Loui
  132. physics

    Why would an aneurysm (a widening of an artery) be especially subject to ruputering? I am thinking the pressure is greater than what the artery can handle. How do I express this? Thank you.

    asked by Loui
  133. Math

    A Man and 6 boxes weigh 300 lbs. If the man weighs 228 lbs., how much does each box weigh?

    asked by Taylor
  134. English

    I still have a few doubts on some sentences. I really hope you can have a look at them. 1) You have to go (?) through the metal detector. 2) Nature was an instrument of God (but not "an The English Renaissance was less connected to (not with) the visual

    asked by Henry1
  135. English

    I forgot to include the following sentences. Thank you very much 1) We went sightseeing in that huge city. We had a guided tour. The sad part was in Chile. They stole a lot from us. 2) Actually, they hotel was a five-star-hotel with no restaurant or pools

    asked by Henry1
  136. History

    I just want my answer to be clarified. So the original idea of boundaries was to separate the land among the territories and provinces...??? And make locations on maps seem easier? --I still feel like I'm missing out on some things, but I don't know what

    asked by Anonymous
  137. English (Grade 5)

    This is not in order. Please put the story about "The wishing well in order" 1. Today is a particularly busy day at the well. 2. This wishing well is very popular 3.It is New Years Day 4.Other People make wishes about their families. 5. For this reason the

    asked by Rachel
  138. calculus

    integrate (cos3x)^2/(1-2pcos(2x)+p^2) dx from x=0 to 2pi for 0

    asked by Anonymous
  139. math

    If a pro basketball player has a vertical leap of about 35 inches, what is his hang time? Use the hang-time function V = 48T²

    asked by Juan
  140. Algebra

    How do I find the perimeter of a triangle DMG which has coordinates D(3,-2), M(3,4) and g(1,-2) - my son can't do the problem and I don't remember how to do it anymore

    asked by Dad
  141. Physics

    The Cyclotron lab is not really designed to handle radioactive beams, but Briggsium is too weird to ignore. The physicists propose to generate it in a nuclear reaction immediately behind the accelerators, and are trying to see if they can get the beam all

    asked by Nadya
  142. physics

    rare element very low carbon are composed of symmetrical triangle that have very much, and which are closely linked in the mirror and solid form what can ...

    asked by dilaver@info.al
  143. math

    f(x)=-0.092x^2+5.3x-51.2 graph f in [ 20,40,5]by[0, 30,5]

    asked by Anonymous
  144. Business

    Describe thwe business organization with the basic legal, socila,economic environment

    asked by Anonymous
  145. business

    why can businesses started by young people face a lower risk of failure than adult businesses?

    asked by karen
  146. science

    blank nerves carry informatation from the 5 senses to the brain. this allows us to see, smell, hear, taste and touch. whats the blank?

    asked by nick
  147. Earth Science

    I need to calculate the discharge results for the following dates: April 4 2:52 mins 1.55 meters 5 2:40 1.63m 6 2:06 1.7m 11 1:17 1.86m 12 :59 1.82m 13 1:10 1.8m Please help me.

    asked by George
  148. political science

    Which President developed the Policy of preemption with regard to foreign policy?

    asked by michelle
  149. world history

    why was the congo free state not able to make a profit in the early years?

    asked by lala
  150. statistics

    Four friends decide to buy a bag of 56 gold coins..Each person contribute the following Sue $320 John $300 Mike $220 Betty$ 160 Please determine the apportionment using a.Hamilton method b.Jefferson method C.Webster method

    asked by Mike...
  151. Math

    Arthur is trying to figure out the heights of 3 of his friends. Here are the facts he know: 1. The sum of the heighta oglf these 3 friends is 17 fast 8 inches. 2. The shortest friends is 5 feet 6 inches tall 3. The other 2 friends differ in height by 4

    asked by Please Help
  152. Math

    Please help to convert the following(Show work please!!! 1.62500 Grams to kilograms 62500 Grams to Pounds 62500 Grams to Ounces 2.44500 Centimeters to meters 44500 Centimeters to yards 44500 Centimeters to Inches

    asked by Mike...
  153. general chemistry

    Calculate the molar mass that would be obtained from the actul experimental data under the following conditions. The unknown is mehy propy ether (CH3OC3H7) which has the vapor pressure of 375.2 torr at room temperature, 20C. The volume of the flask is

    asked by Jasmine
  154. Math

    graph each linear function. y= -x + 4 y= 2/3x + 1 y= 2x + 1 y = -1/2x + 3

    asked by zac
  155. pre- algebra

    In a survery, students were asked whether they play basketball or tennis. Of 34 students, 24 play basketball and 13 students play tennis.4 students play neither. How many students play both sports? Is it 7 students?

    asked by Trace
  156. MATH

    2, -4, 8,... The first term of the sequence above is 2, and every term after he first term is -2 times the preceding term. How many of the first 50 terms of this sequence are less than 100? (A) 22 (B) 25 (C) 28 (D) 30 (E) 37

    asked by allison
  157. statistics

    given a sample size of 30, and one sample t=-2.5, what would conclude about the sample from which the mean was drawn?

    asked by ryee
  158. statistics

    given that u=100 X=91, s=27, and N=30 (a)calculate t. (b)write a sentence interpreting the value of t as a two- tailed test. (c)write a sentence interpreting the value of t as a one-tailed test.

    asked by sassy
  159. chem

    Identify the correct equilibrium constant, Keg, expression 2H2(g)+02(g)2H20(l)?

    asked by tracy
  160. Science/Math

    We have 30 grams of clay. We understand that Density=Mass/Volume. We understand that the Density of water is 1.0 and in order for the clay boat to float in the water Density needs to be less than 1.0. So my question is using 30 grams of clay what design

    asked by Paul
  161. biology

    explain how mitosis helps an organism to grow.

    asked by princess
  162. AP Chemistry

    write the keq expression for the following reaction and determine the value of the Keq at 25degree celcius: MnO2(s)+4H+(aq)Mn2+(aq)+2H2O(l)+Cl2(g)

    asked by Rita
  163. english

    14. When one buys insurance, you need to be clear about your needs. __ Pronoun shift in number __ Pronoun shift in person __ Ambiguous reference __ No error

    asked by tony
  164. JAD

    For the following equation, state the value of the discriminant and then describe the nature of the solutions. -15x² + 2x + 13 = 0 What is the value of the discriminant?

    asked by Anonymous
  165. Spanish

    1. Hay que ______ agua, ¿verdad? a. conserva b. conservar c. conservé d. conservo A? 2. Quiero dormir. Por favor, ____ la luz. a. apagamos b. apago c. apagué d. apaga B? 3. "¿Dicen Uds. la verdad?" "Sí, siempra la _______." a. decimos b. digo c.

    asked by mysterychicken
  166. chemistry

    Give the ph value to get anatase tio2

    asked by pradee
  167. Math

    I need some help!!! Multiply (Simplify your answer) (4x +5)(9x² +2x +7)

    asked by Mary
  168. Algebra

    In an assembly line of a factory, which produces networking switching hubs, two robots are utilized. The first one (A) is able to produce 40 microchips per hour, whereas the second one (B) produces 30 microchips per hour. For a total production of 400

    asked by Gloria
  169. World history

    What was the economy of Syria like before the current revolution? Do you know any good website for it? Please help me!

    asked by Lindy
  170. Math

    Solve. 25x^4-15x^2+2=0

    asked by Mary
  171. Algebra

    X+y+z=2200

    asked by Jacob
  172. math

    what is ,the range of the numbers 5,17,16,17,15

    asked by efren llamas
  173. Algebra 1

    -3t/t^3-t^2

    asked by Ashley
  174. physics

    At what speed should an object be projected to reach the maximum range of 200 m ?

    asked by David
  175. Physics

    A 984 kg car is driving along a boardwalk. The car's center of mass is 33 cm in front of the rear wheels, and the distance between the front and rear wheels is 2 m. What total force does the car's front tires exert on the boardwalk? Give your answer in

    asked by paige
  176. business

    On balance, do you believe that the benefits of free trade outweigh the drawbacks? Why or why not?

    asked by TM
  177. Math

    I need to find the domain of f(x) = (3x+3)/ (x^2 -3). I keep getting (U SQUARE Root of 3 and - Square root of 3 U ) Does that mean that the answer is all real numbers? I know that x can not=3, What am I doing wrong? Thanks.

    asked by Suzanne
  178. Math

    Could someone answer this question so I understand it. Thanks Find the indefinite integral: çx/ã3x^2+4 dx Use C as the arbitrary constant.

    asked by JL
  179. Earth Science

    How do I ocnvert meters into cubic meters? For example: measuring areas and velocity I come up with this: area 1.55m x 27.47 = 42.74 velocity 21.9/172 seconds = 0.123 area x velocity = 5.22381 How do I convert 5.22381 into cms?

    asked by George
  180. Communication

    How you currently communicate your gender, social, and cultural identities in face to face and online environments, are they differently and why

    asked by Theresa
  181. phi

    Catherine goes to her local movie theater only to see romantic comedies. Since Catherine did not go to the movies yesterday, there is not a romantic comedy playing at her local theater. The reasoning above is flawed because the evidence

    asked by David
  182. critical thinking

    critical thinking habits of mind are always positive.

    asked by raydel
  183. Chemistry

    where in the atom would you put a region of fixed small volume if you wished to maximize the chance o finding the electron inside the volume?

    asked by Becca
  184. English

    I need help analyzing this poem please Seasonal Anxiety Spring never felt like a beginning— Something, perhaps, to do with school And all the school-year's slow unspinning From wound-up time as from a spool Aimed at Summer's golden rule. Beginnings are

    asked by Katie
  185. Chemistry

    A 34.6 g block of metal at 2.1oC is dropped into 100.0 g of water at 97.3oC. If the specific heat of the metal is 0.084 cal/goC, what will the final temperature of the water be?

    asked by Kat
  186. social studies

    what forms part of the escarpment along the southern edge of the african continent

    asked by haley
  187. research methods

    a bag of 100 marbles contains 0 blue, 25 green, 25 mixed,and 20 clear. what is the probality of selecting a blue? ablue and green? a marble that is not clear? ablue on the first draw and a clearon the second draw?

    asked by maria
  188. statistics

    assuming a two tailed one sample test is being used,what ie the critical value for t given the following sample sizes. N=10 N=15 N=30

    asked by ryee
  189. physics

    gold and silver have densities of 19.3 and 10.5 grams per cubic centimer, respectively. If you have eual volumes of each, which one will have the larger mass? I am thinking the gold. how do i prove it? Thank you

    asked by Loui
  190. algebra readenes

    what happens when you watch tv to much?

    asked by jessica
  191. Math

    Four friends decide to buy a bag of 56 gold coins..Each person contribute the following Sue $320 John $300 Mike $220 Betty$ 160 Please determine the apportionment using a.Hamilton method b.Jefferson method C.Webster method

    asked by Mike...
  192. English

    Thank you very much for your information.Here are some sentences I'd like you to check 1) You've to enter the airport. Don't use contracted forms. 2) When the plane lands, go to the baggage reclaim where you can collect your baggage. 3) I'm sure you'll

    asked by Henry1
  193. Grammar

    Could you say... lend a hand in helping... or is it just..lend a hand... Because lend a hand and help both mean the same thing.

    asked by Anonymous
  194. English

    Thank you very much for the information. I added a few more things on the same subject. I included the doubts in parentheses. 1)Go (not pass) through the metal detector (?) .Go through passport control where an official checks your passport. 2) You have

    asked by Henry1
  195. statistics

    calculate the 95% confidence interval for u given X=100, s=25, and N=101

    asked by maria
  196. genaral islamic

    A wife has applied farsakh in the syariah court. Then later she moved out of the home. The husband, a practicing Islamic worker disagrees with the wife’s action and accused her wife of nusyuz. He said the wife is just being intolerant and having negative

    asked by syah
  197. Science

    What is the effect of increasing "dead space" ?

    asked by Sana
  198. feg-01

    transcribe the following words; 1. comb 2. examination 3. photograph 4. island 5. debut

    asked by babloo
  199. statistics

    calculate both the pearson and spearman correlation coefficient for the data below. state whether ther are significant? writ a brief statement to explain the results generated by each correlation. self-esteem 10.00,

    asked by ryee
  200. Math

    Use the quadratic formula to solve the equation. x² - x = -2 Type an exact answer, using radicals as needed. Express complex numbers in terms of i. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.)

    asked by Mary
  201. maths

    find the volume of a rectangular prism with a length of 5in.,width of 6 in.and height of 7 in.

    asked by blen
  202. math

    Multiply (b + (1)/(5)) (b + (1)/(3)) Simplify your answer

    asked by Mary