Questions Asked on
March 3, 2015

  1. Chemistry

    For the titration of 50.00mL of 0.1000 M ammonia with 0.1000 M HCl, calculate the pH (a) before the addition of any HCl solution (b) after 20.00mL of the acid has been added

    asked by Anonymous
  2. Chemistry Dr. Bob

    Balanced Equation: 2PbS+ O2 --> 2PbO +2SO2 How many grams of oxygen are required to react with 0.124mole lead(II) sulfide? Ummmm.. I tried to convert it to grams? 0.124 mol * molar mass of PbS (239.3) = 29.67 g of PbS then tried to plug it into the

    asked by Jennie
  3. English

    1. It rains more often. 2. It rains oftener. 3. It rains most often in this area. 4. It rains oftenest in this area. ---------------------------------- Which ones are grammatical? Are all grammatical? Which ones are commonly used?

    asked by rfvv
  4. quant

    8 cars are in race and different timing for each car then find avg speed.

    asked by mamatha
  5. Chemistry Help

    How many moles of hydrogen atoms are there in 178 mL of 0.20 M H2SO4? Write your answer in scientific notation. Please help

    asked by annoymous
  6. English

    1. village:a very small town in the countryside 2. village:a very small town in the country 3. He lives in the country. 4. He lives in the countryside. ----------------------------- Are 'country' and 'countryside' the same in meaning? Can they

    asked by rfvv
  7. English

    1. If I miss so much school again, how can I become a teacher? 2. If I miss so many schools again, how can I become a teacher? -------------------------- Which one is correct? Is #2 grammatical?

    asked by rfvv
  8. Health

    Powerful way to improve powerful drinkers access to treatment is to make____part of primary care

    asked by Anonymous
  9. chenistry

    this is confusing me so bad!! Nitrogen gas reacts with hydrogen gas to produce ammonia by the following equation: N2(g)+3H2(g)→2NH3(g) If you have 5.79g of H2, how many grams of NH3 can be produced? I said, 2/3 *5.79 = 3.86 but that's not the answer.. it

    asked by Jennie
  10. physics

    An object uniformly accelerates at a rate of 1.20m/s^2 east. While accelerating at this rate, the object is displaced 470.4m east in a time of 28 s. What velocity did this object reach in this time ? I used Vf=Vi+at which will be Vf=(1.20)(28) but i feel

    asked by Dania
  11. Math

    provide a table of six values that represent a linear relation? 6 values mean that 6 number on each side x and y value?

    asked by dana
  12. math

    Please help me on linear relation. I have tries but I am really stuck on the creating table and graphing. 1. provide a table of six values that represent a linear relation. All the y-values must be less then zero. 2. provide a table of six values that does

    asked by d
  13. Chemistry

    Consider two non-interacting Fermions (half-integer spin) confined in a “box” of length L. Construct the antisymmetric wave functions and compare the corresponding groundstate energies of two systems; one with particles of identical spin and the other

    asked by lolo
  14. political theory

    I don't have an assignment due, but I'm having trouble understanding the themes that are in the Persian Letters by Montesquieu. Has anyone read them? I'm in college. I'm having trouble understanding the Harem sequence, and these themes: lack of self

    asked by bayley
  15. maths

    If each glass is 250ml,how many glasses can I fill with 2ltres of orange juice?

    asked by deizyah
  16. Chemistry

    What is the concentration of Na+ ions if 35.0 mL of 2.50 M NaOH is reacted with 47.0 mL of 1.50 M HCl? I did M=Moles/Volume Moles=M*V Moles=2.50M*0.035= 0.0875 Am I right? If I am right, I don't know what to do next. Please help

    asked by annoymous
  17. Math

    Mr. Tankard’s minivan has a 21 gallon tank. He can travel 354 miles on one tank of gas. How many miles per gallon does the minivan get? How many tanks of gas will he need to travel 870 miles?

    asked by Sam B
  18. jinah coloege

    how many electrons does a charge of 1.63 μc represent

    asked by ali amir
  19. utu secondary school papuanew guinea

    A given mass of air has a volume of 6.0l at 1 atom.what volume will it occupy at 190mm hg if the temperature does not change?

    asked by charlie
  20. math

    1.39 1.61 1.6 1.53 1.62 1.61 1.64 1.59 1.62 1.51 1.52 1.6 the mean height of the students is 1.57 meters. what does it imply? a.) there are more students whose heights are below 1.57 meters b.) the average height of the students is 1.57 meters. c.) most of

    asked by chevlios
  21. math

    The range of the of the ages of the Glee club officers is 5. this means that a.) the difference of all ages of the officers is 5 b.) one qualifies to be an officer if he is 5 yrs below the mean age. c.) one qualifies to be an officer if he 5 yrs above the

    asked by chevlios
  22. math

    the sum of the squares of two consecutive numbers is 265. find the numbers

    asked by chevlios
  23. Physics

    A chair of weight 75.0N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 45.0N directed at an angle of 40.0¡ã below the horizontal and the chair slides along the floor. Using Newton's laws, calculate

    asked by Boxiang
  24. Calculus, HELP!!!!!!!!!

    A cable runs along the wall from C to P at a cost of $6 per meter, and straight from P to M at a cost of $10 per meter. Let x be the distance from C to P. If M is 8 meters from the nearest point A on the wall where P lies, and A is 18 meters from point C,

    asked by Francois
  25. physics

    If a man weighs 820N on d earth what would be on Jupiter, where the acceleration due to gravity is 25.9m/s

    asked by ikeokwu stephen chidebere
  26. islamic studies

    In matters of fiqh, if one is faced between 2 choices: a. a stronger opinion based on Quran & Sunnah but if it turns out in reality to be wrong, one might commit a sin or make certain ibadah invalid,etc b. a weaker opinion but a safer option Which option

    asked by alif
  27. Statistics

    so we will be having a quiz about hypotheses testing and i cant still figure out the difference between the null hypothesis with alternative hypothesis. PLEASE HELP ME DIFFERENTIATE THE TWO. And i still get confused between one tailed test and two tailed

    asked by Ngiti
  28. math

    James has a board that is 3/4 foot long. He wants to cut the board into pieces that's each 1/8 foot long. How many pieces can James cut from the board? My work; 👈--0-----:-----1/4-----:-----1/2-----:-----3/4 |____________|_________|__________|

    asked by candyce
  29. Math

    Hi! I need help with this. Thank you! Directions: Solve this equation by doing it twice; one time using the substitution method and one time using the graphing method. -2/3 x + y = 2 2x – 3y = 6

    asked by Steffi
  30. physics

    The weight of an object is 480N on the earth and 120N on the moon,calculate the mass of the object on the moon

    asked by rebone
  31. lo assignment

    write down five physical changes experienced by boys only and five experienced by girls only during puberty?

    asked by VRGINIA
  32. using skills

    Which of the following statements is correct regarding the use of the web in the classroom? A. It provides learning opportunities for both teachers and children. B. It should be used as a teacher resource. C. It's too advanced for young children to use. D.

    asked by lauren
  33. Physics

    a billiard ball moving at 4.0 m/s strikes another billiard ball at rest and moves off at 3.46 m/s in a direction of 30 degrees from the original of the motion. What is the velocity of the target ball?

    asked by Reynaldo
  34. Physics

    A 100 kg crate rest at the back of the bed of a pick up truck. The length of the crate is 1 m in the length of the bed is 4 m. There is no friction between the bed of the truck in the crate. If the truck is traveling at 25 m/s just before it hits the wall,

    asked by David
  35. Math

    Prove that if the sides of one angle are parallel to the sides of another angle, the angles are congruent. Given: BA||ED, BC||EF, AND BEG Prove:angle ABC is congruent to angle DEF

    asked by Serenity
  36. Chemistry

    calculate the density of 50.0 g of gold that occupies a volume of 2.59 mL.

    asked by Lee
  37. businessmath

    Statistics show that the sales force of a certain company successfully closed 986 sales out of 1,700 sales calls. What was their percent success rate? If needed, enter decimals rather than fractions. Do not enter the percent symbol in your answer.i need

    asked by babysunshine
  38. CHEMISTRY

    Using a 0.20 M phosphate buffer with a pH of 6.5, you add 0.72 mL of 0.46 M NaOH to 58 mL of the buffer. What is the new pH of the solution? (Enter your answer to three significant figures.) I don't even know where to begin!! I just need a set up of the

    asked by Mack
  39. Physics

    A 1500-kg blue car is travelling south, and a 2000-kg red sports car is travelling west. If the momentum of the system consisting of the two cars is 8000kg.m/s directed at 60 degrees west of south, what is the speed of each car?

    asked by Reynaldo
  40. physical science

    A stone of 8 kg mass falls from the top of an 80 m-high building. Find the velocity of the stone when it reaches the ground

    asked by tye
  41. using skills

    All of the following are math materials except A. two-dimensional cutouts. B. wipe-off folders. C. paper and pencil. D. sand and clay. b. is my answer

    asked by lauren
  42. math

    16. A picture of a star has 6 identically matched points. What is the least number of degrees that you can rotate the star onto itself? (1 point) 60° 120° 180° 240 How do i figure this out?

    asked by Louis
  43. Chemistry

    an ideal system absorbed some amount of heat and gas expand and the piston move to 0.4 meter against than the atmospheric pressure. If the cross sectional area of the container is 0.6 meter2. What is the amount of heat absorbed?

    asked by Muhammad
  44. Statistics

    find the probability that you will get a "sum" of 5 or greater in rolling two dice experiment. How do you do this?

    asked by Tamera
  45. 6TH GRADE MATH

    The value of the dependent variable in a function is always __________ the value of the independent variable. 1.GREATER THAN 2.DEPENDENT ON 3.LESS THAN 4.EQUAL TO

    asked by ASSAAPPP
  46. Chemistry Basics- Please Help!

    Choose either homogeneous or heterogeneous. Tea: homogenous Concrete: heterogeneous Soda: homogeneous Soapy Water: homogeneous Salt Water: homogeneous Granite: heterogeneous Please help, and thanks lots :D

    asked by Anonymous
  47. Physics

    Consider an air-bubble level that is sitting on a horizontal surface. Initially, the air bubble is in the middle of the horizontal glass tube. (a) If the level is pushed and a force is applied to accelerate it, which way would the bubble move? Which way

    asked by David
  48. life orientation

    analyse the effectiveness of communication in relationship

    asked by NIKY
  49. Social Studies

    1. What dynasty ruled the Korean peninsula from AD 668 to AD 935? Meiji Qin Silla*** Tokugawa 2. What type of government ruled North korea after World War II communist**** democratic dictatorship oligarchy 3.Both Japan and the Koreas been influenced by

    asked by Madi
  50. math

    3000 for 3 years at 1.8% compounded monthly

    asked by kris
  51. social studies

    which is the main climate in cyprus 1. tropical and dry 2. continental cool summer 3 mediterranean 4 humid subtropical

    asked by ana
  52. Physic

    A 60-g bullet fired at two blocks resting on a surface with coefficient of kinetic friction =0.5. The bullet pass through a 8-kg block and make this block slides 0.8 m. And then the bullet lodges in another block which is 6 kg. The bullet make it slides

    asked by Takako
  53. maths

    1.solve the set of linear equation by matrix method.a+3b+2c=3,2a-b-3c=-8,5a+2b+c=9 solve for a,b,c 2.solve by Guassian elimination method, (a)a+2b+3c=5,3a-b+2c=8,4a-6b-4c=-2, (b)

    asked by emmanuel konwei
  54. History

    what did reconstruction fail to do in south carolina? A.readmit the state to the union B.establish the belief in white supremecy among some group C.return control of state politicsto local leaders D.free african americans from slavery? I Got C but im not

    asked by Help me,plz
  55. History

    What in his life made president Lincoln want to abolish slavery? I know that he created the Emancipation Proclamation to end slavery.

    asked by Izzy
  56. Statistics

    A random sample of state gasoline taxes is shown for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 0.21? assume normal distribution.

    asked by Say
  57. maths

    A number of circles touch each ather. The area of the smallest circle is 4n cm^2 and each consecutive circle has area 9/4 times that of the previous one. If the distance AB=665/8. Line AB passes at the centre of the circles. How many circles are there?

    asked by jay
  58. Math

    line segment AB is parallel to line segment CD and AB is not equal to CD. Prove that A, B, C, and D must lie in a plane and form a trapezoid. I really don't understand and i need help, thanks.

    asked by Serenity
  59. american Literature check answers

    How were the Dark Romantics different from the Transcendentalists? They explored the darker sides of the human soul. They revered reason over intuition or imagination. They believed in the innocence of all people. They disregarded any spiritual side of

    asked by jimm
  60. MATHS

    in a GP,the product of the 2nd and 4th terms doubled the 5th term and sum of the first four term is 80.Find the GP.

    asked by SALAUDEEN
  61. algebra word problems

    The length of a rectangle is 6 inches longer than its width. The perimeter of the rectangle is 28 inches. If x represents the width of the rectangle, which equation can be used to find its value?

    asked by none
  62. american Literature check answers part 2

    What thought torments the speaker in "The Raven"? The raven has been sent by his greatest enemy. The speaker has wasted his life studying old books. The speaker will never see his beloved Lenore again. The speaker will never understand the books he reads.

    asked by jimm
  63. Chemistry

    How many grams (of mass m) of glucose are in 355mL of a 5.50% (m/v) glucose solution? You have a solution that is 18.5% (v/v) methyl alcohol. If the bottle contains 2.49L of solution, what is the volume (V) in milliliters of methyl alcohol? A 6.00 % (m/v)

    asked by Jennie
  64. word problem

    Ieda bakes 73 cupcakes and accidentally drops 5 of them. She divides them equally into 13 containers for a bake sale for the school band. How many cupcakes does Ieda have left?

    asked by none
  65. 6th Grade Math

    A deep-sea diver must descend and ascend in short steps to equalize pressure on his body. If the diver rises toward the surface too fast, he may suffer from a physical condition called "the bends". Suppose the diver started at 82 feet below the surface and

    asked by MusicLover14
  66. Probability

    Consider 10 independent tosses of a biased coin with the probability of Heads at each toss equal to p, where 0

    asked by Jonathan
  67. Chemistry

    Calculate the mass/volume percent of a NaCl solution in which 182g of NaCl is dissolved in enough water to give a total volume of 4.78L . Would I do 182/4780ml *100?

    asked by Jennie
  68. math

    anne spent half of her money on CDs. After se spen half of what was left on stickers

    asked by k
  69. math

    Points $D$, $E$, and $F$ are the midpoints of sides $\overline{BC}$, $\overline{CA}$, and $\overline{AB}$, respectively, of $\triangle ABC$. Points $X$, $Y$, and $Z$ are the midpoints of $\overline{EF}$, $\overline{FD}$, and $\overline{DE}$, respectively.

    asked by John
  70. Math - Geometry - Triangle Medians and Altitudes

    Points D, E, and F are the midpoints of sides BC, CA, and AB, respectively, of triangle ABC. Points X, Y, and Z are the midpoints of EF, FD, and DE, respectively. If the area of triangle XYZ is 21, then what is the area of triangle CXY?

    asked by John
  71. algebra

    The drama club has 41 members. There are nine more girls than boys. How many boys are in the club

    asked by kay
  72. solid mechanics

    A Piece of material 15 cm long by 2.5 cm square is in compression under a load 100 KN. If the modulus of elasticity of the material s 105 GPa and Poisson¡¯s ratio is 0.25, find the alteration in length if all lateral strain is prevented by the

    asked by navneet
  73. solid mechanics

    A steel plate is subjected to tensile stresses of 200MPa and 150 MPa at right angles to each other. Determine the normal and tangential stresses on a plane inclined at 60 to the 200 MPa stress. Also find the plane on which the resultant stress has maximum

    asked by navneet kumar
  74. physics

    a stone is thrown upward with a speed of 24.0m/s how fast is it moving when it reaches a height of 13.0m?

    asked by oratile
  75. physic

    Question Part Points Submissions Used A hypodermic syringe contains a medicine with the density of water (figure below). The barrel of the syringe has a cross-sectional area of 2.88 10-5 m2. In the absence of a force on the plunger, the pressure everywhere

    asked by sam
  76. Chemistry help!! Fast

    true or false??? The larger molecules dissolve best in a solvent with a low molecular weight.

    asked by Jennie
  77. math

    sasha has a bag of l red sock, 1 blue sock, 1 white sock, and 1 green sock. she pulls a sock out of the bag without looking, puts it back, and pulls out another sock out of the bag without looking. What is the probability that she will pull out a white

    asked by Little_rebel
  78. life oriatation

    to what extent can intrapersonal conflict affect:choice of career

    asked by maphoko
  79. Math, Analytic Geometry

    Derek wants to determine the height of the top of the backboard on the basketball goal at the playground. He places a standard 12-inch ruler next to the goal post and measures the shadow of the ruler and the backboard. If the ruler has a shadow of 10

    asked by Kniasia
  80. Chemistry Help

    WHAT???? which of these are electrolytes?? CH3CH2OCH2OH PCl3 Na2CO3 O2

    asked by Jennie
  81. algebra II

    The following rational function describes concentration in blood of a certain medicine taken once depending on time, find a. the horizontal or oblique asymptote(s), if any, b. the vertical asymptote(s), if any, c. describe their possible meanings.

    asked by Kristen
  82. math

    A trainer for a professional football team keeps track of the amount of water players consume throughout practice. The trainer observes that the amount of water consumed is a linear function of the temperature on a given day. The trainer finds that when it

    asked by Kathryn
  83. Criminal Justice

    I need 8 reason why innocent individuals are wrongfully convicted, and i need an example for each. Is there a website or article that can help me answer this?

    asked by breeamberr
  84. Earth Science

    Which of the following is NOT generally associated with a thunderstorm? A. tornado B. lightning C. dry air

    asked by Emi
  85. physics

    Object 1 has a velocity of 3m/s and a mass of 5kg. Object 2 also has a mass of 5kg but isn't moving. Object 1 collides with Object 2 and they move off together. Work out their speed using the principle of conservation of momentum.

    asked by help me
  86. Chemistry Help

    I have no idea where to begin with this?? This class is moving so fast! Dr. Bob222 I made a 100 on my prelab!! and the online test was so fast I was going through my notes and I was scrambling to figure it out and look up stuff on the periodic table and

    asked by Jennie
  87. Biology

    When talking about Mendel's experiments, can the Parent (P) generation also be called P1?

    asked by Anonymous
  88. math

    Christopher made three and one fourth dozen cupcakes . He added vanilla icing to one third and chocolate to the rest . How many cupcakes in dozen have chocalote icing ? I need answer and show work pls

    asked by Hannah
  89. Child education

    As Ms. Ramirez planned for her group time, she considered the best way to begin. Which one of the following would NOT be an effective way for her to begin group time? A. Asking individual children if they brought something to share B. Leading children in

    asked by Danielle
  90. stats

    a captain claims that at least 85% of the residents in his barangay have household pets. to test this claim a researcher randomly selected a sample of 550 residents and find that 495 of them do have household pets. at 0.05 level of significance. formula

    asked by Anonymous
  91. math

    If you buy two DVDs for $8 each and one poster for for $6 and there was a 40% store discount what was the sales price of the purchase How do I get started I am confused???

    asked by Tony
  92. Algebra 2

    Simplify each sum or difference. State any restrictions on the variable. -3x/x^2-9+4/2x-6

    asked by Sam
  93. calculus

    If u=(0,2,3) and v=(1,3,-1) find the projection of u onto v a) 1/3 u b) 3/11 v-> -> c) (1,1,-1) d) (1/3, 1, -1/3)

    asked by muntrey
  94. chemistry help

    When carbon dioxide and carbon react the balanced equation is Co2+C--------------2Cq Calculate the mass of carbon monoxide formed from 4.4g of carbon dioxide

    asked by Victoria
  95. calculus

    Find Indefinite Integral of dx/(x(x^4+1)). I think that Im complicating it too much. I moved the dx out making it 1/(x(x^4+1))dx than 1/(x^5+x)dx. I think i have to use formula indef integral of dx/(x^2+a^2) = 1/a(tan^-1(x/a)) but im stuck i don't know

    asked by anna
  96. math

    explain how you can use a number line to show that 3/6 and 1/2 are equivalent fractions?

    asked by anita
  97. Math

    Warren poured some chips of the Pringles can, 6 chips were broken which represents 8% of the can. In all, how many chips were in the Pringles can?

    asked by Amy
  98. Chemistry

    What volume (mL) of 0.20 M HCl needs to be added to 1.23 L of 0.10 M acetic acid to reduce the percent ionization to 1.00%? Assume the volume of HCl added is negligible compared to the volume of the whole solution, and that the small x approximation is

    asked by Molly
  99. 7th Grade Math.

    I have been trying to work this out but just cant. Find the function rule. X -2 -1 0 1 2 Y 9 4 -1 -6 -11 Thanks, ~JH

    asked by Jarrod
  100. Social Studies

    Name two advances made by Indian mathematicians without which computers would be impossible today.

    asked by Gummybear a.k.a Nicole
  101. Criminal Justice

    what is the definition of government miscounduct

    asked by breeamberr
  102. Science

    Name and explain in detail four organizations or agencies that work to address human violations

    asked by Petunia
  103. Math

    Several friends each have 2/5 of a bag of peanut left over they should bought 2 fewer bags

    asked by Anonymous
  104. chemistry help fast

    The following reaction occurs in a blast furnace Fe2O3 +3Co--------2Fe+3Co2 Calculate the mass of carbon monoxide needed to reduce 16 tones of iron (111) oxide

    asked by Victoria
  105. chemistry

    Can someone show me the answer to this as I am well confused. What mass of lead oxide reacts with 2400dm3 of carbon monoxide?

    asked by alastair
  106. Mathematical literacy

    Assume there are 4 people living in the house nd their daily average consumption is 25litres per person per day nd there are 30days in a month . Calculate the average monthly water consumption for the household.

    asked by Lizzy
  107. what to say?

    my assignment was to create a product so i chose an energy drink called electrify however i don't know what to say when presenting what can i say so ppl can buy my product or simply anything to say during mt presentation

    asked by anonymous
  108. geometry

    Rita bikes 4 miles in 21 minutes . At this rate, how many miles does he bike in a hour ?

    asked by bridgette
  109. math

    Here are linear equations Find the value of x and y 1/2x + 1/3y = 8 3/2x - 4/3y = -4 I got y= -72/7 and x= 160/7

    asked by OpTicScumpii
  110. Physics

    A cannon shoots a cannonball with a mass of 20 kg and a net force of 2000 N a) label the three force pairs(HORIZONTAL ONLY) b) What is the acceleration of the cannonball? c) Does the cannon continue to move/ Explain why or why not. Specify which force will

    asked by Nam Nguyen
  111. math

    if u buy 15 bags of chips and it only costs $20 and u have $62 how much change are going to get back

    asked by iffy
  112. civics

    hi i need help on the cold war? and world war 2? what happen in the cold war and world war 2

    asked by nick
  113. Science

    Human Body & Disease Practice 1) Which of the following effects would you expect if red blood cells were shaped like neurons? :They would not be able to move as easily through capillaries.*** :They would more easily carry out gas exchange in the alveoli.

    asked by TheLOUDEST_0430
  114. Math

    Ms. Henderson’s 5 art classes are turning in their final projects for the year. The table shows the numbers and type of project turned in during her first 4 classes. Part A Write the ratio of paintings to sculptures for each class in simplest terms.

    asked by Anonymous
  115. Chemistry (organic)

    You have a solution that contains 5.0 g of oxalic acid dissolved in 150 mL of water. This solution is placed in a separatory funnel, and then 100 mL of diethyl either is added to the separatory funnel and an extraction is performed (diethyl ether and water

    asked by Brendon
  116. pharmacy tech

    2. How do you determine the number of grams of an active ingredient in a solution based on the percent strength?

    asked by Lalo
  117. Earth Science

    What color will a star be with a surface temperature of 5000–6000 K? A. blue B. yellow C. white my choice is B yellow

    asked by Emi
  118. physics

    A constant torque of 200Nm turns a wheel about its centre. The moment of inertia about this axis is 100kgm^2

    asked by ben
  119. Chemistry

    What is the percentage of nitrogen in N2O?

    asked by Ciaria
  120. economics

    The production function for our Production is Q = 25L - 0.05L^2; where Q is output and L is man-hours. What level of man-hours will maximize total output?

    asked by Anonymous
  121. Science 8th Grade

    1. How Will resistance change when the voltage increases in an electrical circuit if the current remains constant A. It will decrease **** B. It will stay the same C. It will increase D. It will decrease, then increase

    asked by *
  122. Chemistry

    How many nonbonding electrons does phosphorus have? is it 5 valence electrons

    asked by Ciaria
  123. math

    A number of circles touch each ather. The area of the smallest circle is 4picm2 and each consecutive circle has area 9/4 times that of the previous one. If the distance AB=665/8. Line AB passes at the centre of the circles. How many circles are there?

    asked by jay
  124. Algebra 2

    From 1990-1994 the mail order sales of health products can be modeled by S= 10t^3+115t^2+25t+2505 where S is the sales (in millions) and t the number of years since 1990. In what year were about $3885 million health products sold.

    asked by Help
  125. Algebra 2

    For 1980-1996 the total exports (in billions of dollars) of the U.S. can be modeled by E=-0.13t^3+5.033t^2-23.2t+233 where t I'd the number of years since 1980. In what year were the total exports about $312.76 (use finding zeros to solve)

    asked by Anonymous
  126. Physics

    Can someone walk me through how to work this? A block is being pushed up a frictionless incline by an applied horizontal force, F=12.7N. (The angle is θ = 23.80° and the mass is 1.70kg. a) How many forces are acting on the block? b) How many of those

    asked by James
  127. Physics

    Can someone walk me through how to work this? It's worded weirdly and I'm not sure how to solve it. Mass M1= 2.2 kg lies on a frictionless table, pulled by another mass M2= 4.1 kg under the in of Earth's gravity. a) What is in N the net force acting on the

    asked by James
  128. Physics

    Can someone help me solve this one? I've tried it a few times, but I don't think I'm getting it right. A block of mass M = 2.2 kg starts from rest at a height of 3.6 m on a fixed inclined plane. The coefficient of kinetic friction between the block and the

    asked by James
  129. Math

    The area of a rectangular field is given by the trinominal t^2-4t-45. The length of the rectangle is t+5. What is the expression for the width of the field? A) t-9 B) t-5 C) t-11 D) t-7 Can someone please help? Thank you!

    asked by Tia
  130. History

    Compare and contrast the ideas and policies, domestic and foreign, of Roosevelt, Taft and Wilson. Where can I find information that compares their domestic policies? -My Answer so far: Roosevelt, Taft, and Wilson were all progressive reformers, but their

    asked by TayB
  131. History

    How and why did the Conservation Movement begin? (What makes the Progressive Era Conservation Movement different from environmentalism today?

    asked by TayB
  132. History

    In what ways did the Progressive Era set the stage for U.S. involvement in the world today? In what ways are things different now?

    asked by TayB
  133. Chemistry

    What is the volume of 20.55 grams of hydrogen gas at a pressure of 1.215 atmospheres at 29.3 degrees Celcius? how do you solve this

    asked by Johnny
  134. Chemistry

    What is the magnetism of F2+, and how many unpaired electrons does it possess? Would F2+ act the same way as F+? In that case it would be paramagnetic and have 2 electrons.

    asked by Anonymous
  135. Math

    Bill can ride his bike 7 1/2 miles in a hour. a. How far will he ride in 3 hours? b. How far will he ride in 1/3 of an hour? I think for a. the answer is multiply so it would be 22 1/2 miles and for b. it would be 2 1/2 miles. Is this correct?

    asked by Alice
  136. Math

    Find the area of the basketball court. The length of the rectangle is 100m and the radius of the seni-circle is 25m.

    asked by Ant
  137. math

    At a school camp, 30% of the students were boys. When 87 students left the camp after the second day, half the original number of boys were left behind, and the number of girls decreased by 20%. How many girls were at the camp in the beginning?

    asked by jessi
  138. Math

    Sue's kitten eats 1/12 pound of food everyday. If Sue buys food in 5 pound bags, how many days does one bag of food last? I think I would divide and the answer would be 60 days is this correct?

    asked by Alice
  139. MATH

    In Mrs.Marshall'd classroom, 6/7 of the students play sports. Of the students who play sports, 4/5 also play as instrument. If there are 35 students in her class, how many play sports and an instrument?

    asked by Joanna
  140. Math

    Amy uses 8 cups of flour to make 3 identical loaves of bread.How much flour is in each loaf? I think it is division and I got 2 2/3 cups of flour. Is this correct?

    asked by Alice
  141. Math

    I can throw a ball 10 1/3 yards. My cousin can throw a ball 13 1/12 yards. How much farther can my cousin throw the ball? I think I have to subtract and my answer is 2 3/4 yards farther. Is this correct?

    asked by Alice
  142. Math

    Hank's fish bowl holds 9/10 gallon of water. It is now 2/3 full. How much water is in the bowl? I subtracted and my answer is 7/30. Is this correct?

    asked by Alice
  143. Chem Dr. Bob Plz

    Dr. Bob, I just did a home lab with citric acid and sodium bicarbonate and had to put them in cups and measure before and after.. I put 1.02g of sodium bicarbonate in a cup with water and stirrer (54.66g) then added .77g of citric acid and supposed to add

    asked by Jennie
  144. math

    8sin^4(x)

    asked by Anonymous
  145. Chemistry

    Identify the precipitate in this reaction: calcium nitrate reacts with sodium phosphate. 2Na3PO4 + 3Ca(NO3)2--->6NaNO3 + Ca3(PO4)2 is that right ?

    asked by Ciaria
  146. Chemistry

    Hello, I'm having some trouble getting started on this question: "Calculate the volume and mass required to make 0.1 M solutions of Propionic Acid (1.0 M) and Sodium Propanoate (96.06 g/mol)" I would normally not have trouble answering this question when

    asked by Leo
  147. Math

    Bill plays ball for 9 hours each week. His friend Mark spends as much time playing ball. Who plays more ball? I think I have to divide. So I think Mark plays more ball by 10 4/5 hours. Is this correct? Thank you so very much for your help Ms. Sue.

    asked by Alice
  148. English

    Is 'purse' and 'handbbag' the same? Are they used by women?

    asked by rfvv
  149. Chemistry

    The following is a Limiting Reactant problem: Magnesium nitride is formed in the reaction of magnesium metal with nitrogen gas in this reaction: 3 Mg(s) + N2(g)  Mg3N2(s) How many grams of product are formed from 2.0 mol of N2 (g) and 8.0 mol of Mg(s)?

    asked by Ciaria
  150. calculus

    Find the arc length of the given function/curve on the given interval. y=ln(x-sqrt(x^(2)-1)); x ϵ [1, sqrt(2)]

    asked by kales
  151. math

    I am less than 20 I am an odd number I am the square root of 225 I am

    asked by princess
  152. math

    emily pays $93 each year to belong to a photography club. next year, the membership fee will increase by 12.5%. emily estimates that the membership will just be under $100 each year after the increase. what is a true statement about emily's estimate? a.

    asked by Angelina
  153. Math

    Sara long jump was 10 feet. That is 5/6 foot longer than Tom's long jump. Did Tom jump more or less than 10 feet? I think I have to multiply and so Tom's jump was less by . I think his jump was 8 1/2 feet. Is tis correct?

    asked by Alice
  154. Math

    Which relation is a function? (Points : 1) A.(1, 2), (1, 5), (1, -1), (1, 4)} B. {(8, -1), (2, -1), (3, 8), (2, 5} C. {(-3, 4), (-2, 5), (0, 9), (0, 12)} D. {(7, 12), (1, -5), (3, -10), (2, -5)} Is its C :P?

    asked by Gia
  155. Chemistry Dr. Bob

    Now, I'm going to post how to figure out the theoretical yield of carbon dioxide from 1.00g sodium bicarbonate... The reaction of citric acid and sodium bicarbonate is written as H3C6H5O7(aq) + 3 NaHCO3(aq) → Na3C6H5O7(aq) + 3 H2O(l) + 3 CO2(g) Um.. I

    asked by Jennie
  156. Chemistry

    Would you expect H2O or H2S to be more volatile at the same temperature and pressure? Why?

    asked by Derek S.
  157. Math

    What is 8 3/4 - 5 5/6 =? Shouldn't the denominator be 24 ? What is this answer please show the work.

    asked by Kalelha
  158. Math

    What is 13 3/5 - 6 1/4 =? Show me the work please.

    asked by Kalelha
  159. chemistry

    What does ammonium Iodide equation look like dissolved in water?

    asked by tia
  160. chemistry

    Why do compounds with strong intermolecular attractive forces have higher boiling points than compounds with weak intermolecular attractive forces?

    asked by Ciaria
  161. Algebra

    A person's trip from the city to his cabin in the mountains was 229.6 miles. If his car used 4.5 gallons of gas for the trip, estimate the number of miles his car gets to the gallon

    asked by Anonymous
  162. Chemistry

    Why is the first ionization energy of a nonmetal much higher than that of an alkali metal in its same period?

    asked by Ciaria
  163. English

    To Mr. Reed who had previously answered my question on realism in A Raisin In the Sun and told me to to write about Travis sleeping on the couch , thank you but I need to write realism in Acts 1, 2, 3 and since you thought that only the second one was

    asked by Notafanofschool
  164. Chemistry AP

    At 20◦C the vapor pressure of pure methanol (CH3OH) is 89.0 torr and of pure water (H2O) is 17.5 torr. A solution of methanol and water has a total vapor pressure of 35.5 torr at 20◦C. Calculate the mole fraction of methanol in this solution. Assume

    asked by Ethan
  165. Art Help!!! Thank you

    1.The Greek temple has often inspired the design of what type of American structure? A. amphitheater B. Colosseum C. courthouse D. Bridge Is the answer A?? Thanks in advance 2. Why might a college choose to use Greek architectural elements such as columns

    asked by anonymous
  166. math derivatives

    derivative of ln[(1+v)^(1+v)(1-v)^(1-v)] I know my log rules allow me to rewrite this as ln[(1+v)(1+v)+(1-v)(1-v)] but what I do from there i don't know.... Wolfram says it is ln(v+1)-ln(v-1)but i don't know how to get that...

    asked by pat
  167. math

    bobs monthly phone bill is made up of a 10.00 fee plus $0.05 per min.bobs phone bill for july was 22.00 write an equation to model the situation using m to represent the number of min. solve the bequation to determine the number of phone mins.bob used in

    asked by cynthia
  168. Math

    Solve each system by using the elimination method. Make sure to write your answer in (x,y) form. 1.) 3x-5y=2 2x+5y=13 2.) 3x+11y=4 -2x-5y=9

    asked by Yola
  169. Algebra

    5/2 divided by 5/9 =

    asked by Anonymous
  170. Math Check

    Can someone check my answers? Thanks! Tell whether the system is inconsistent OR dependent. 1.) -7x+6y=-4 14x-12y=8 2.) 3x-y=7 -6x+2y=8 My answers: 1.) inconsistent 2.) Dependent

    asked by Fee
  171. computer

    how to use a google fusion table

    asked by bhakti N
  172. chemistry

    How many dots should be indicated in the electron dot structure of arsenic? How many electrons are in the highest energy orbital of the element copper?

    asked by Ciaria
  173. Science

    What is another example of a gas in your classroom? I know air would be one but I can't think of what would be another one present in a classroom. Thanks...

    asked by Brandi
  174. calculus

    If a snowball melts so that its surface area decreases at a rate of 3 cm2/min, find the rate at which the diameter decreases when the diameter is 11 cm.

    asked by Danijela
  175. Algebra

    13 1/3 divided by 22 1/2

    asked by Lisa
  176. L.A

    Which of the following is the best definition of stage directions? A. Notes on how to write the story B. Notes on how the work is to be staged and prformed C. Notes on how to place props and lightning. D. Notes on how to build the set to match the

    asked by Anonymous
  177. Physics

    A 39-turn circular coil of radius 3.20 cm and resistance 1.00 Ω is placed in a magnetic field directed perpendicular to the plane of the coil. The magnitude of the magnetic field varies in time according to the expression B = 0.010 0t + 0.040 0t2, where B

    asked by Chris
  178. Chemistry Dr. Bob

    This is in response to the fact that my experiment had me come up with my own.. I was supposed to measure out as close to 1g as possible of sodium bicarbonate as possible.. This is my lab procedures: Plastic Cup A 1. Measure out 50 mL of distilled water

    asked by Jennie
  179. Emerson

    I'm helping my son he is in 4th grade . His hw it's hard and this is the problem : find two mixed numbers. So that the sum is 7 2/8 and the difference 2 4/8.

    asked by Claudia
  180. Precalcuse

    A plane is headed N40E at 400 mph.there is a wind speed of 50mph from the south.if no correction is made for the wind,what are the final direction and ground speed of the plane?

    asked by Damanta
  181. L.A

    Read the opening line of dialogue from Anne Frank and Me: "Right now we are in Westerbork, in Holland. Earlier today they opened the door and shoved more people into our car... I think it is the 3rd of September, 1944..." How does this line contribute to

    asked by Anonymous
  182. math

    You need at least 5 pounds of potatoes and onions. Potatoes cost $4 per pound and onions cost $2 per pound. You can spend at most $18. a) define the variables b) a system of linear inequalities that represents this situation.

    asked by Inequalities
  183. math

    what percent of student perform at the national average. there are 32 kid

    asked by Anonymous
  184. english 201

    An essay on the yellow wall paper by charlotte Gilman. how do I start.

    asked by slymeena
  185. physics

    A 4 cm candle sits 15 cm in front of a converging lens with a focal length of 6.0 cm. Draw a ray diagram showing the image used and determine the image distance and magnification. Please help me answer!

    asked by sarah
  186. Chemistry

    Why are the atomic masses of elements usually decimal numbers?

    asked by Ciaria
  187. AP CHEM LAB

    How much .25 molar NAOH would you need to add to 50 mL of 2.85 molar HCl to reach the equivalence point?

    asked by Lola
  188. L.A

    Read the following stage directions and dialouge from billy Elliot: [Billy suddenly sees DAD and freezes. His reaction puzzles Mrs. Wilkinson for a second. The music comes to a standstill. Mrs. Wilkinson turns to see Dad.] DAD: You.Out.Now What do these

    asked by Anonymous
  189. Chemistry

    If an element has 12 protons and 17 neutrons, how many electrons must it have?

    asked by Ciaria
  190. L.A

    Read the following stage directions and dialouge from billy Elliot: [Billy suddenly sees DAD and freezes. His reaction puzzles Mrs. Wilkinson for a second. The music comes to a standstill. Mrs. Wilkinson turns to see Dad.] DAD: You.Out.Now What most likely

    asked by Anonymous
  191. social studies

    The North liked high tariffs on foreign goods because?

    asked by Rian
  192. chemistry

    Complete and balance this reaction: sulfuric acid reacts with barium chloride

    asked by Ciaria
  193. Math

    What is 8 3/4 - 5 5/6 = Is 24 the Denominator for this problem? Show all the work.

    asked by Kalelha
  194. Math

    Come pleat the table to represent each part of the formula. The data values have been put in ascending order. ---- X, (X, - x) 2 30 ? 32 ? 33 35 49 50 50 71 73 77

    asked by Ashley salisbury
  195. Math

    For the first of two basketball games the price of each reserved seat was $1.50,the price of each unreserved seat was 5 cents, and the number of reserved seats sold was 1/25 of the number of unreserved seats sold.If, at a second game, the price of the

    asked by Brian
  196. Chemistry

    Write the formula for iron (III) sulfate. My answer is Fe2(SO4)3

    asked by Ciaria
  197. math

    Emma's school plans to build a rectangular basketball court with an area of 150+175t square feet. The length of the basketball court is 25 feet as shown in the following diagram. Thank you!

    asked by Kyle
  198. chemistry

    Perform this operation and report the answer to the correct number of significant figures: What is the mass of a cube of aluminum that is 4.0 cm on each edge? The density of aluminum is 2.7 g/cm3. Show all calculations leading to an answer. Vcube=

    asked by Ciaria
  199. math

    Emma's school plans to build a rectangular basketball court with an area of 150+175t square feet. The length of the basketball court is 25 feet.What is the width of the basketball court? Thank you!

    asked by Kyle
  200. Chemistry Ap

    At 20◦C the vapor pressure of pure methanol (CH3OH) is 89.0 torr and of pure water (H2O) is 17.5 torr. A solution of methanol and water has a total vapor pressure of 35.5 torr at 20◦C. Calculate the mole fraction of methanol in this solution. Assume

    asked by Ethan
  201. math

    Janice plans to build a rectangular table top with an area of 60+20r square inches. The width of the table top is 10 inches. What is the length of the table top?. THANK YOU

    asked by Sam
  202. Physics

    Energy Budget for a Rocket in Free Space: Recall the analysis of the rocket engine in Project I, Flight of the Rocket. Although the momentum of the rocket and its exhaust is conserved (constant), their energy is not; energy must be supplied by the

    asked by Steve
  203. math

    Tony plans to install a window pane that has a length of 8 inches and a width of 6 inches. He decides that the length has to be reduced by z inches. He says that the new area of the window pane will be 48−z. Is Tony correct? Why or why not? THANK

    asked by Sam
  204. chemistry

    when the nuclear charge increases, does the electron;s attraction to the nucleus get stronger or weaker ?

    asked by lan
  205. Physics

    A square coil with 30 turns has sides that are 18 cm long. When it is placed in a 0.31-T magnetic field, a maximum torque of 0.60 N⋅m is exerted on the coil. What is the current in the coil?

    asked by Keith
  206. calculus

    Find the arc length of the given function/curve on the given interval. y=ln(x-sqrt(x^(2)-1)); x ϵ [1, sqrt(2)]

    asked by kales
  207. 7th grade science

    how much work is done on an object with 25 kg on earth if it moves 13m? i really need help

    asked by KVNG J
  208. Pre-calculus (trigonmetry)

    The Bermuda Triangle is an unmarked area in the Atlantic Ocean where there have been reports of unexplained disappearances of boats and planes and problems with radio communications. The triangle is an isosceles triangle with vertices at Miami, Florida,

    asked by Lucina
  209. math

    five friends went to a baseball game. three of the friends each bought a ticket for x dollars and a soda for six dollars the other two friends each bough only tickets. write and simplify and expression that represent the amount of money spent

    asked by she
  210. Chemistry Dr. Bob

    Plastic Cup B Mass of cup, water and stirrer: 53.75g mass of sodium bicarbonate: 2.02g mass of citric acid: 1.52g total mass of all: 57.29g mass of cup, solution, stirrer after reaction: 56.59g difference (CO2): 0.70 g Now, Here's the problems it's

    asked by Jennie
  211. Chemistry Dr. Bob222

    Ok, UMMMM I thought I was good.. Till now.. Ok, For Cup C Mass of cup,water,stirrer: 55.15 Mass of sodium bicarbonate: 2.02g mass of citric acid: 0.77g total mass: 57.94g mass of cup,solution, stirrer after reaction: 57.64 difference (CO2): 0.30g Part B:

    asked by Jennie
  212. chemistry

    The heat of solution of potassium acetate (KC2H3O2) in water is -15.3 kJ/mol. If 18.8 g of KC2H3O2(s) is dissolved in 655 mL of water that is initially at 25.8 °C, what will be the final temperature (in degrees Celcius) of the resulting aqueous solution?

    asked by Fiona
  213. chemistry

    Given the following data: 4PCl5(s) ¨ P4(s) + 10Cl2(g) ƒ¢H = +1774 kJ P4(s) + 6Cl2(g) ¨ 4PCl3(l) ƒ¢H = -1278.8 kJ Find the ƒ¢H of the following reaction: PCl5(s) ¨ PCl3(l) + Cl2(g)

    asked by Hi
  214. chemistry

    Given the following thermochemical data: H2O(l)+2AgNO3(aq) ¡æ 2HNO3(aq)+Ag2O(s) ¥ÄH = 44.8 kJ 2Ag(s)+¨öO2(g) ¡æ Ag2O(s) ¥ÄH = -31.0 kJ ¨öO2(g)+H2(g) ¡æ H2O(l) ¥ÄH = -285.8 kJ Use Hess¡¯s Law to determine ¥ÄH for the reaction:

    asked by Help?
  215. math

    Susie uses 1/2 to help compare 1/3 to 3/5 and to help in comparing 3/7 with 2/3. Explain how 1/2 help determine which fraction is greater in each combination.

    asked by tammy
  216. math

    How do I round this to the nearest ten thousand 1,112,433

    asked by Ceylonia