Most popular questions and responses by Olivia
  1. Math

    Which set of best describes the numbers used on a scale for a standard thermometer? A.whole numbers B.rational numbers C.real numbers D.integers I choose Real Numbers if I am incorrect can you explain why.

    asked on May 10, 2015
  2. AP Chemistry

    Consider the following reaction. CaSO4(s) Ca2+(aq) + SO42-(aq) At 25°C the equilibrium constant is Kc = 2.4 10-5 for this reaction. (a) If excess CaSO4(s) is mixed with water at 25°C to produce a saturated solution of CaSO4, what are the equilibrium

    asked on October 20, 2012
  3. precal- PLEASE HELP!

    secx/secx-tanx=sec^2x+ secx+tanx

    asked on March 25, 2012
  4. ela

    1. Which of the following is not part of the rising action in "Raymond's Run"? (1 point) A. Squeaky and Raymond confront Mary Louise and her friends on Broadway. *** B. Mr. Pearson hints to Squeaky that she should consider letting the new girl win. C.

    asked on September 16, 2016
  5. Calculus 1

    A fence is to be built to enclose a rectangular area of 220 square feet. The fence along three sides is to be made of material that costs 6 dollars per foot, and the material for the fourth side costs 13 dollars per foot. Find the dimensions of the

    asked on October 31, 2011
  6. Chemistry

    For the reaction 4FeCl2(aq) + 3O2(g) → 2Fe2O3(s) + 4Cl2(g), what volume of a 0.650 M solution of FeCl2 is required to react completely with 8.58 × 1021 molecules of O2?

    asked on February 23, 2015
  7. 6TH GRADE

    Describe a real-world situation that is modeled by multiplying two fractions or mixed numbers. Can someone give me an example?

    asked on September 24, 2014
  8. Chemistry

    Blueprint paper can be made by soaking paper in a brown solution of Fe(CN)6^3- and iron (III) ammonium citrate. Wherever the paper is exposed to bright light, the paper turns blue. Explain why this happens.

    asked on November 29, 2017
  9. chemisty

    does NF3 follow the octet rule

    asked on November 28, 2010
  10. Math

    You use the line of best fit for a set of data to make a prediction about an unk on value. The correlation coefficient for your data is 0.984. How confident can you be that your predicted value will be reasonably close to the actual value? A. I can’t be

    asked on January 24, 2018
  11. Chemistry

    A 1.42-g sample of a pure compound, with formula M2SO4, was dissolved in water and treated with an excess of aqueous calcium chloride, resulting in the precipitation of all the sulphate ions as calcium sulphate. The precipitate was collected, dried, and

    asked on December 13, 2011
  12. Mathematics

    Can someone check my answers? 1. For the data in the table, does y vary directly with X? If it does write an equation for the direct variation.(X,y) (8,11) (16,22) (24,33) Yes y=2.75x Yes y=0.6875x*** Yes y=1.375x No y does not vary directly with X ** (For

    asked on December 13, 2016
  13. Math

    Triangle LMN is similar to Triangle XYZ The scale factor of triangle LMN to Triangle XYZ is 2:5 what is the length of the zx

    asked on April 15, 2017
  14. Math help, Please

    An inverted conical tank (with vertex down) is 14 feet across the top and 24 feet deep. If water is flowing in at a rate of 12 ft3/min, find the rate of change of the depth of the water when the water is 10 feet deep.

    asked on December 29, 2014
  15. Math

    A jet flies at an altitude of 52,800 feet. What is the height of the jet in miles? I need help with this problem please

    asked on November 5, 2014
  16. Chemistry

    3) The following set of data was obtained by the method of initial rates for the reaction: 2 HgCl2(aq) + C2O42-(aq) 􀀏 2 Cl-(aq) + 2 CO2(g) + Hg2Cl2(s) What is the rate law for the reaction? [HgCl2], M [C2O42-], M Rate, M/s 0.10 0.10 1.3 × 10-7 0.10

    asked on October 27, 2010
  17. Math

    Martin you some apples to make muffins Omar use some apples to make applesauce Omar used five fewer than half as many apples as Martin use? Could Martin has used 10 apples why or why not use expression to help you decide show your work. I need help

    asked on February 25, 2019
  18. Geometry

    (SAT Prep) The perimeter of pentagon ABCDE is 30 in, AB = 7 in, BC = CD = 6 in, DE = 5 in. How many sides of the pentagon have equal length?

    asked on February 14, 2017
  19. physics

    The position of a particle moving along the x axis is given by x=3.0t^2 - 1.0t^3 , where x is in meters and t in seconds. What is the position of the particle when it achieves its maximum speed in the positive x direction

    asked on November 14, 2013
  20. Physics

    A lead ball, with an initial temperature of 25.0oC, is released from a height of 119.0 m. It does not bounce when it hits a hard surface. Assume all the energy of the fall goes into heating the lead. Find the temperature (in degrees C) of the ball after it

    asked on December 15, 2011
  21. Maths

    If 2 numbers have a difference of 2.38, one number is 3 times bigger than the other number and the two numbers both add up to 6, what could the two numbers be?

    asked on February 1, 2017
  22. Physics

    A lead ball, with an initial temperature of 25.0oC, is released from a height of 119.0 m. It does not bounce when it hits a hard surface. Assume all the energy of the fall goes into heating the lead. Find the temperature (in degrees C) of the ball after it

    asked on December 15, 2011
  23. English

    Which senses are appealed to in these lines from Macbeth? Nay, had I pow'r, I should / Pour the sweet milk of concord into hell, / Uproar the universal peace… A. smell, taste, and touch B. hearing, sight, and smell C. sight, taste, and hearing D.

    asked on March 20, 2013
  24. music

    why is sonata-allegro considered to be dramatic and rewarding?

    asked on October 28, 2007
  25. Physics

    A daredevil decides to jump across a 15 m wide canyon on his motorcycle. The opposite side of the canyon is 3 m lower than the side the daredevil starts on. The daredevil drives his motorcycle off the cliff at a speed of 27 m/s. How long does it take the

    asked on October 17, 2013
  26. chemistry

    magnesium in flashbulbs burn according to the equation 2Mg + O2 ---> 2MgO what mass of Mg combines with 5.80 L of O2 measured at STP?

    asked on May 2, 2013
  27. spanish

    are there any web sites that offer online quizzes with immediate answers?

    asked on October 2, 2008
  28. Math

    The bases of a triangular prism are equilateral triangles. The surface area of the prism is 80 square units. If the area of one of the triangular bases is half the area of one of the rectangular faces, what is the area of one of the triangular bases of the

    asked on March 30, 2016
  29. Math

    Wendy saves 30% of her income each month. ⅜ of her expenditures is spent on cosmetics, ⅙ of it is spent on transport and ⅖ of the remainder is spent on food. If she spends $469 on cosmetics and food altogether, how much does she save each month?

    asked on April 18, 2018
  30. math

    To needs to cut strip of wrapping paper that are each 9 inches wide.If TV has 2 rolls of wrapping paper that are each 15 feet long,how many 9 inch strips can he cut?

    asked on March 10, 2015
  31. Chemistry

    A solution is prepared by mixing 45.00 mL of 0.022 M AgNO3 with 13.00 mL of 0.0014 M Na2CO3. Assume volumes are additive. Calculate [Ag+], [CO32-], [Na+] and [NO3-] after equilibrium is established.

    asked on November 15, 2013
  32. Math

    14 oz for $3.50 or 24 oz for $5.28.Which size bag is the better buy?

    asked on November 12, 2018
  33. Observing develpment of the young child

    One of the advantages using an anecdotal record as a recording Method is that? A, the observer needs no special traing, B, it gives a complete picture of the child's development C, the observer is restricted to recording only the kind of behavior D, the

    asked on August 21, 2012
  34. math

    you went to lunch with your friend and the bill w!@#$%^& 27.00. your lunch is $8.00 more than your friend's. How much was your friend's lunch?

    asked on January 15, 2016
  35. Math HELP!

    Consider the function y = 3x5 – 25x3 + 60x + 1. Use the first or second derivative test to test the critical points. How many relative maxima did you find? 0 1 2

    asked on December 15, 2014
  36. Calculus (math)

    A boat leaves a dock at 2:00 P.M. and travels due south at a speed of 15 km/h. Another boat has been heading due east at 20 km/h and reaches the same dock at 3:00 P.M. How many minutes past 2:00 P.M. were the boats closest together?

    asked on November 8, 2014
  37. math

    There is a slide in the park that is 18 feet long. The ladder to the top of the slide is 7.5 feet long. If the ladder and the slide are perpendicular, what is d, the distance from the top of the slide to the ground? If necessary, round to the nearest tenth

    asked on February 19, 2015
  38. Chemistry

    In aqueous solution, hydrochloric acid, HCl, and sodium carbonate, Na2CO3 react to produce gaseous carbon dioxide, CO2, water, H2O and sodium chloride, NaCl. A 10.0 g impure sample of Na2CO3 is dissolved completely in water; then treated with 3.00 mol

    asked on June 15, 2014
  39. History

    . How and why did the role of American women change during World War II? Why was that change temporary? What sort of work did women do, and how were they received in their work?

    asked on April 24, 2019
  40. Algebra

    You deposit $3,000 in a savings account that earns 6% simple interest. How long will it be before you have a total of $3,500?

    asked on December 31, 2014
  41. math

    Recently a census was taken on space station Gamma. Of the 100 residents interviewed, 75 traced their ancestry to the planet Omicron, 85 traced their ancestry to the planet Omega and 60 residents traced their ancestry to both planets. How many residents

    asked on September 3, 2013
  42. Economics

    Kelly’s utility function is given by U = 5X + 2Y, where MUX = 5 and MUY = 2 I know MRSxy would be 2.5 What is MRSXY when X = 1 and Y = 5? When X = 2 and Y = 2.5? Also how would I draw a sample indifference curve?

    asked on October 25, 2017
  43. Math

    Write 0.5% as a fraction.

    asked on February 27, 2019
  44. Math

    At 2:30 p.m. the thermometer outside of sharlene's window read 44.c. it had risen 3. between noon and 2:30 p.m and 12. between 7:00 a.m and noon. What was the temperature at 7:00 a.m

    asked on May 16, 2016
  45. Chemistry

    A reaction between gaseous sulfur dioxide and oxygen gas to produce gaseous sulfur trioxide takes place at 600◦C. At that temperature, the concentration of SO2 is found to be 1.14 mol/L, the concentration of O2 is 1.39 mol/L, and the concentration of SO3

    asked on April 23, 2016
  46. chemistry

    How many milliliters of an aqueous solution of 0.238 M magnesium bromide is needed to obtain 9.01 grams of the salt?

    asked on April 4, 2017
  47. math

    Andy and Sam are saving money to go on their senior trip. The amount of money that Andy will have at the end of each week, w, can be expressed at A(w) = 20w + 300. The amount of money that Sam will have at the end of each week, w, can be expressed at S(w)

    asked on December 3, 2012
  48. Math

    Barb is making a bead neaklace. She strings 1 white bead,then 3 blue beads,then 1 white bead,and so on. Write the numbers for the first eight beads that are white. What is a rule for the pattern?

    asked on January 13, 2016
  49. chemistry

    H2(g) + Cl2(g) HCl(g) Consider the unbalanced equation above. 3.95 L of H2 and 1.00 L of Cl2 are reacted under the same conditions of temperature and pressure. (a) How many liters of HCl will be produced? (b) How many liters of reactant are in excess? i

    asked on October 20, 2014
  50. Chemistry

    When excess NaOH is added to Zn(OH)2, the complex ion Zn(OH)4 2- is formed. Determine the molar solubility of Zn(OH)2 in .10 M NaOH. Compare with the molar solubility of Zn(OH)2 in pure water. I thought I knew how to do this problem, but I'm not getting

    asked on November 10, 2013
  51. physics

    How long does it take a 20 kW steam engine to do 7.3×10^7 J of work?

    asked on January 3, 2012
  52. Physics

    Someone please help me, I am having the worst time understanding this problem. Where do I begin? Atomic physicists ignore the effect of gravity within an atom. To see why, calculate and compare the gravitational and electrical forces between an electron

    asked on October 18, 2007
  53. science

    i have to design one dimensional model and I need to know why thermal is so important? Thanks

    asked on March 13, 2019
  54. Chemistry

    use the appropriate standard reduction potentials in the appendix of your book to determine the equilibrium constant at 285 K for the following reaction under acidic conditions 4H+(aq) + MnO2(s)+2Fe+2(aq)----> Mn+2 (aq)+2Fe3+(aq)+2H2O(l)

    asked on April 22, 2016
  55. Math

    Last week, Marcia played goalkeeper for her hockey team. She stopped 20 out of 30 shots on goalm . This week, marcia faced 36 shots. She stopped shots on goal in the same ratio as the previous week. How many shots did marcia stop?

    asked on September 28, 2008
  56. Math 12

    A car is purchased for $30,000. It depreciates at a rate of 18% per year. What equation would represent the value, y, of the car after x number of years? Use this equation to find the value of the car after five years.

    asked on January 10, 2017
  57. Math

    A store is having a 20% off sale on all merchandise.if jada buys one item and saves $13 at the sale what was the original price of her purchase?explaine

    asked on September 30, 2016
  58. Maths

    If it takes 6 men 4h to dig a hole 6m deep,how long will it take 10 men to dig a hole 5m deep?

    asked on October 16, 2014
  59. Physics

    A 1.9 kg ball is attached to a ceiling by a string. The distance from the ceiling to the center of the ball is 1.13 m, and the height of the room is 3.00 m. (a) What is the gravitational potential energy associated with the ball relative to the ceiling? J

    asked on November 21, 2012

    If the time at town A(LONGITUDE 75"W)is 5pm on friday.What will be the time and day at town B(LONGITUDE 120"E)

    asked on February 26, 2017
  61. Math

    For y= (3x)/(2e^x+e^-1), use graphing techniques to find the approximate intervals on which the function is: a) increasing b) decreasing c) concave up, d) concave down then find any e) local extrema f) inflection points

    asked on November 25, 2012
  62. Quantum Physics

    A proton is confined in an atomic nucleus of size 2 fm. Determine the fundamental limit on the uncertainty of any prediction for the measurement of the momentum of the proton in the nucleus.

    asked on May 18, 2011
  63. College Physics

    A weight W is now placed on the block and 7.7 N is needed to push them both at constant velocity. What is the weight W of the block? Answer in units of N.

    asked on January 5, 2011
  64. Chemistry

    use the appropriate standard reduction potentials in the appendix of your book to determine the equilibrium constant at 285 K for the following reaction under acidic conditions 4H+(aq) + MnO2(s)+2Fe+2(aq)----> Mn+2 (aq)+2Fe3+(aq)+2H2O(l)

    asked on April 22, 2016
  65. MATH

    hi i need help: explain how using a spinner would help find the experimental probability that a soccer player will score a goal on a penalty kick. Suppose the player makes 75% of his of his penalty kicks.

    asked on December 16, 2015
  66. Social Studies

    what 5th grade social studies word starts with Y,Z,and N?

    asked on December 18, 2012
  67. MATH

    mark scores 6 points. amy scores 11 points. how many points does mark need to tie the game? WRITE A NUMBER SENTENCE TO SOLVE. THANK YOU

    asked on November 6, 2012
  68. MATH

    mark scores 6 points. amy scores 11 points. how many points does mark need to tie the game? WRITE A NUMBER SENTENCE TO SOLVE. THANK YOU

    asked on November 6, 2012
  69. Business and Personal Law

    So I have a project and I need help on finding a court case for Retirement/Wills. The court case has to be Interesting,Unusual,Funny, Outrageous/Frivolous, Or, all of the above. Do you know where to find any interesting cases or know any cases that is

    asked on February 12, 2019
  70. Physics

    A block of mass m = 4.30 kg slides along a horizontal table with speed v0 = 8.50 m/s. At x = 0 it hits a spring with spring constant k = 31.00 N/m and it also begins to experience a friction force. The coefficient of friction is given by μ = 0.150. How

    asked on October 5, 2014
  71. Math- Calculus

    Locate the absolute extrema of the function on the closed interval: y= 4/x+tan(pix/8), [1,2]

    asked on November 8, 2012
  72. physics

    A person wants to push a lamp (mass 7.2 kg) across the floor, for which the coefficient of friction is 0.23. Calculate the maximum height above the floor at which the person can push the lamp so that it slides rather than tips (Fig. 9-62).

    asked on October 21, 2012
  73. Physics

    A block starts at rest and slides down a fric- tionless track. It leaves the track horizontally, flies through the air, and subsequently strikes the ground.What is the speed of the ball when it leaves the track? The acceleration of gravity is 9.81 m/s2 .

    asked on January 16, 2012
  74. Physics

    Suppose a certain type of deciduous tree releases 7500 leaves on average each fall. If the average mass of each leaf is 1.7 g and a 135 000 acre forest has 206 of these trees per acre, how many kilograms of leaves are dropped on the forest floor each fall?

    asked on March 8, 2011
  75. 7th grade

    what is the modern atomic theory

    asked on November 19, 2009
  76. Chemistry

    Please help me break this problem down.. Thanks lot. Light with a wavelength of 425 nm fell on a potassium surface, and electrons were ejected at a speed of 4.88 X 10^5 m/s. What energy was expended in removing an electron from the metal? Express the

    asked on January 13, 2008
  77. Physics

    Could someone help me on how to put this all together. Atomic physicists ignore the effect of gravity within an atom. To see why, calculate and compare the gravitational and electrical forces between an electron and a proton separated by 10-10m. Im

    asked on October 18, 2007
  78. History

    How did the Cold War affect American life ?

    asked on April 25, 2019
  79. trig

    an observer at A looks due north and sees a meteor with an angle of elevation of 70 degrees. At the same instant, another observer 30 miles east of A seed the same meteor and approximates its position as N 50 degrees W but fails to note its angle of

    asked on January 11, 2015
  80. Chemistry

    A saturated solution of calcium chromate (CaCrO4) freezes at -0.10 C. What is Ksp for CaCrO4? Assume complete dissociation. The density of the solution is 1.0 g/mL.

    asked on November 12, 2013
  81. physics

    An antique carousel that’s powered by a large electric motor undergoes constant angular acceleration from rest to full rotational speed in 6 seconds. When the ride ends, a brake causes it to decelerate steadily from full rotational speed to rest in 8.9

    asked on February 16, 2011
  82. physics

    How would your Mars weight compare to your earth weight if the acceleration due to gravity on Mars is 3.71 m/s2?

    asked on February 9, 2011
  83. social studies

    what are some of the answers to this ancient egypt worksheet?

    asked on October 25, 2010
  84. biology

    How does energy flow through the biosphere?

    asked on May 19, 2010
  85. Chemistry

    Suppose you are studying coordination compounds of Co(II) with the ligand pyridine (py, C5H5N, MW = 79.10). You isolate a crystalline compound and since the only available ions are chloride and nitrate, you hypothesize the empirical formula of the

    asked on April 23, 2007
  86. Chemisty

    Consider a 1.50 L aqueous solution of 3.75 M NH3, where 17.5 g of NH4Cl are dissolved. To this solution, 5.00 g of MgCl2 are added. a. What is [OH-] before MgCl2 is added? b. Will a precipitate form? c. What is [Mg2+] after equilibrium is established? I

    asked on November 14, 2013
  87. physics

    a place kicker must kick a football from a point 32.0 m from the goal. As a resultof the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 23.0 m/s at an angle of 53 degrees to the

    asked on October 8, 2012
  88. art

    The Visual Elements: "Street, Dresden", 1907, oil on canvas by Ernst Ludwig Kirchner Describe the shapes in this painting. Are the shapes organic or geometric? Which ones? Describe how the shapes interact, or "touch" each other. Are the edges of the shapes

    asked on September 14, 2012
  89. math

    Find the length of the diameter of a circle whose endpoints are at (11, 4) and (10, 5).

    asked on June 26, 2012
  90. English

    I need help with this question. I just don't understand what it's asking me. Could someone tell me how I should start it, please? Thank you! Writers often communicate their themes by building clues into the story. Choose one story from Collection 4 and

    asked on January 18, 2012
  91. Metric System

    I have two queations that have to do with the metric system: 1- What connections can you identify between the metric units for length and volume? 2- Why is it difficult to convert miles to yrads or feet? Thanks in advance for your help! 1- What connections

    asked on August 18, 2005
  92. Calculus

    If the instantaneous rate of change of f(x) at (2,-4) is 5, write the equation of the line tangent to the graph of f(x) at x=2.

    asked on July 17, 2017
  93. Science

    If a dune moves 40m a per year, how far does it move in 1 day

    asked on January 26, 2016
  94. chemistry

    A flask that can withstand an internal pressure of 2511 torr, but no more, is filled with a gas at 21.0°C and 758 torr and heated. At what temperature will it burst? i used P1/x=P2/T2 and got 69.6 degrees Celsius. what is wrong

    asked on October 20, 2014
  95. Physics: momentum

    While you are standing on a expanse of smooth ice, your friend throws a heavy ball towards you. How can you maximize your speed after your interaction with the ball? a. More information is needed to determine how you should maximize your speed. b. It

    asked on October 7, 2014
  96. Math

    Suzanne has a liter of apple juice. How many cups with a capacity of 100 mL can she fill with apple juice?

    asked on March 25, 2013
  97. math

    A basketball has a diameter of 29.5 inches. If the basketball is fully inflated, about how many cubic inches of air will it hold?

    asked on March 25, 2013
  98. Chemistry

    It takes 200. seconds for a sample of carbon dioxide to effuse through a porous plug and 280. seconds for the same volume of an unknown gas to effuse under the same conditions. What is the molar mass of the unknown gas? Enter your answer to 3 significant

    asked on February 18, 2013
  99. precal

    1/tanx-secx+ 1/tanx+secx=-2tanx so this is what I did: =tanx+secx+tanx-secx =(sinx/cosx)+ (1/cosx)+(sinx/cosx)-(1/cosx) =sinx/cosx+ sinx /cosx= -2tanxI but I know this can't be correct because what I did doesn't end as a negatvie:( please help

    asked on March 25, 2012
  100. precal


    asked on March 23, 2012


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