Most popular questions and responses by claire
  1. Science

    Which of the following electromagnetic waves is not used for communication?

    asked on November 23, 2014
  2. word problem math

    Dixon and his little sister Ariadne stand next to each other on the playground on a sunny afternoon. Their mother measures their shadows. Dixon's shadow is 18 feet long and Ariadne's shadow is 15 feet long. If Dixon is 6 feet tall, how tall is Ariadne?

    asked on November 16, 2015
  3. Geometry Question (multiple choice)!

    The isosceles trapezoid is part of an isosceles triangle with a 34° vertex angle. What is the measure of an acute base angle of the trapezoid? Of an obtuse angle? 73°; 107° 34°; 146° 73°; 146° 34°; 107° Thank you =) :) ;)

    asked on January 10, 2012
  4. Algebra

    Lesson 10: Quadratic Functions and Equations Unit Test answers please! I need the right ones

    asked on April 12, 2019
  5. math

    Arianna has a large piece of fabric that she wants to use to make some scarves. The number N of scarves she can make is inversely proportional to the area A of each scarf. If the area of each scarf is 3 square feet, then she can make 15 scarves. If the

    asked on May 12, 2016
  6. Chemistry

    So I'm not exactly sure how to answer this problem. NaC2H3O2 is soluble Express your answers as ions separated by a comma. If the compound is not soluble, enter noreaction

    asked on November 13, 2012
  7. math

    The clock face in a famous clock tower has a radius of about 5 meters. What is the area of the clock face to the nearest square meter? Use 3.14 as an approximation for pi.

    asked on May 10, 2016
  8. Calculus

    The base of an isosceles triangle is 8 feet long. If the altitude is 6 feet long and is increasing 3 inches per minute, are what rate are the base angles changing?

    asked on May 11, 2016
  9. Math

    Which of the following problems would NOT have a solution? Five pizzas are shared equally among four people, and you want to know how much each person gets. Ten pizzas are shared equally among five people, and you want to know how much each person gets.

    asked on November 10, 2015
  10. Maths: Partial Differentiation

    1) If x = rcos theta and y = r sin theta, show that partial r / partial x = cos theta and find partial theta / partial x. 2) If z = sin theta.sin phi.sin gamma, and z is calculated for the values theta = 30degrees, phi = 45 degrees and gamma = 60degrees,

    asked on January 9, 2010
  11. Engineering Kinematic

    The particle travels along the path defined by the parabola y=0.5(x^2). If the component of velocity along the x-axis is v=5t [m/s], determine the particle's distance from the origin and the magnitude of its acceleration when t=1s. The initial condition is

    asked on October 16, 2010
  12. physics

    Surprisingly, very few athletes can jump more than 2.0 ft (0.62 m) straight up. Use d = 1/2 gt2 and solve for the time one spends moving upward in a 2.0 foot vertical jump. Then double it for the "hang-time" -- the time one's feet are off the ground.

    asked on March 1, 2011
  13. Calculus Antiderivative Problem

    An object moves along a coordinate line with acceleration a(t)=(t+2)^3 units per second per second. a). The initial velocity is 9 units per second. The velocity function is v(t) = b).The initial position is 2 units to the right of the origin. The position

    asked on November 8, 2013
  14. math

    Lisa and Katie are playing a card game, and a total of 900 points has been scored. Lisa scored 150 more points than Katie. If you let l= the number of points that Lisa scored, and k= the number of points that Katie scored, then the problem can be

    asked on May 18, 2016
  15. Computer Programming

    /* Develop a C program that will determine if a department store customer has exceeded the credit limit on a charge account. For each customer, the following facts are available: a) account number b) Balance at the beginning of the month c) Total of all

    asked on November 22, 2009
  16. Math

    Dawn raises money for her school in a jog-a-thon. She will get three dollars for every lap she completes. If it takes 4 laps to jog 1 mile, and Dawn jogs a total of 12 miles, how much money will Dawn raise for her school?

    asked on November 6, 2015
  17. adding integers

    A stock lost 7 1/8 points on Monday and then another 1 7/8 points on Tuesday. On Wednesday, it gained 13 points. What was the net gain or loss of the stock for these three days? A) a loss of 22 points B) a gain of 4 points C) a gain of 18 1/4 points D) a

    asked on April 13, 2016
  18. Math

    Tickets for a play cost Php 250 for adults and Php 200 for children.The sponsor of the show collected a total amount of not more than lhp 44,000 from more than 150 adults and children who watched the play. A. What mathematical statements represents the

    asked on September 13, 2017
  19. chemistry

    Question: Consider this molecular-level representation of a gas. There are: 5 orange gas particles 6 blue gas particles 3 green molecules of gas (two particles attached together) If the partial pressure of the diatomic gas is 0.510 atm, what is the total

    asked on December 8, 2013
  20. math

    Arianna has a large piece of fabric that she wants to use to make some scarves. The number N of scarves she can make is inversely proportional to the area A of each scarf. If the area of each scarf is 3 square feet, then she can make 15 scarves. If the

    asked on May 12, 2016
  21. math

    The volume of Jupiter is about 1.43*10^15 cubic kilometers. The volume of Earth is about 1.09*10^12 cubic kilometers. The number of Earths that can fit inside Jupiter can be found by dividing Jupiter's volume by Earth's volume. Find this quotient and

    asked on May 19, 2016
  22. ALGEBRA! URGENT. Check Answers!

    1. 18x^2 + 6 + 4x - 15x^2 - 4 + 13x Answer: 3x^2 + 17x + 2 2. 3x^2 + 6 - 2x + 5x - 4x^2 + 9 Answer: -x^2 + 3x + 15 3. 3x^2 + 5x - 7x + 3 - 5x^2 + 2 Answer: -2x^2 + 2x + 5 4. In the expression -7x - 3x^2 + 5. What is the coefficient of x? Answer: I think

    asked on May 27, 2014
  23. Fluid Mechanics

    A circular disc having a diameter of 125cm is immersed in water so that the distance of its perimeter measured vertically below the water surface varies between 60cm and 150cm. Find the total force due to the water acting on one side of the lamina, and the

    asked on October 31, 2010
  24. Calculus

    A conical cistern is 10 ft. across the top and 12 ft. deep. If water is poured into the cistern at the rate of 1 cubic foot per second, how fast is the surface rising when the water is 8 ft. deep?

    asked on May 2, 2016
  25. Physics

    A 20.0 kg box rests on a table. what is the weight of the box and the normal force acting on it? A 10.0 kg box is set on top of the 20.0kg box. Determine the normal force that the table exerts on the 20.0kg box and the normal force that the 20.0kg box

    asked on September 3, 2009
  26. physics

    The Navstar Global Positioning System (GPS) utilizes a group of 24 satellites orbiting the Earth. Using "triangulation" and signals transmitted by these satellites, the position of a receiver on the Earth can be determined to within an accuracy of a few

    asked on November 19, 2018
  27. math

    The diameter of a hydrogen atom is about 5×10^-11 meter. Suppose 8.4×10^8 hydrogen atoms were arranged side by side in a straight line. Multiply these numbers to find the length of this line of atoms. What is the length in scientific notation?

    asked on May 19, 2016
  28. Math

    An auditorium contains 315 occupied seats and was 7/9 filled. How many empty seats were there?

    asked on September 28, 2015
  29. math

    Which statements are true for irrational numbers written in decimal form? A. Irrational numbers are nonterminating. B. Irrational numbers are repeating. C. Irrational numbers are nonrepeating. D. Irrational numbers are terminating.

    asked on April 19, 2016
  30. English (phrasal modals)

    Zach used to work at an independent record label. Negotiating could be exciting, but he was supposed to slant everything in the label’s favor. Some reps used questionable tactics. He couldn’t look at himself in the mirror if he treated people like

    asked on November 19, 2013
  31. Math

    A flying disc has a radius of 7 inches. What is the area of one side of the flying disc to the nearest square inch? Use 3.14 as an approximation for pi.

    asked on February 18, 2016
  32. Physics

    In Figure 10-20, the magnitude of the force necessary to stretch a spring is plotted against the distance the spring is stretched. Figure 10-20 (a) Calculate the slope of the graph, k, and show that F = kd, where k = 25 N/m. (b) Find the amount of work

    asked on October 25, 2011
  33. physics

    Three charged particles are placed at the corners of an equilateral triangle of side d = 1.40 m (Fig. 16-53). The charges are Q1 = +4.0 µC, Q2 = -7.0 µC, and Q3 = -6.0 µC. Calculate the magnitude and direction of the net force on each due to the other

    asked on January 30, 2012
  34. word problem math

    Keith has p pennies, n nickels, and d dimes in his pocket. The total number of coins is 9. The expression 0.01p+0.05n+0.10d0.01p+0.05n+0.10d represents the value of the coins, which is equal to $0.53. He has two fewer nickels than dimes. How many pennies

    asked on May 17, 2016
  35. Math

    On an average day, 34 customers buy a bag of grapes at Jerry's Market. There are an average of 47 grapes in each bag. Round to the nearest ten and then multiply to estimate the number of grapes Jerry's customers buy every day.

    asked on November 6, 2015
  36. Chemistry 121

    What is the lewis dot structure of C2H5F?

    asked on October 21, 2011
  37. Calculus

    Find the limit of the function algebraically. lim x approaches 0 (-7+x)/x^2

    asked on November 26, 2018
  38. mathematic

    The local skateboard company reports that when they produce and sell n skateboards in a week, the cost is represented by the modelc=850+76n . The revenue is represented by the model r=150n. If both C and R are in dollars, write an equation for the profit

    asked on September 30, 2014
  39. Fluid Mechanics

    A cylindrical tank 2m diameter and 4m long with its axis horizontal, is half filled with water and half filled with oil of density 800kg/m^3. Determine the magnitude and position of the net hydrostatic force on one end of the tank. The answers should be

    asked on November 3, 2010
  40. math

    A flying disc has a radius of 6 inches. What is the area of one side of the flying disc to the nearest square inch? Use 3.14 as an approximation for pi. A) 113 square inches B)452 square inches C)38 square inches D) 28 square inches

    asked on May 9, 2016
  41. Math

    Which is the best approximation of the volume of a cylinder with a radius of 10 mm, and a height of 5 mm? Use 3.14 for pi.

    asked on February 2, 2016
  42. physics

    A ball rolls down a hill mainly because of: a. an unbalanced torque b. an unbalanced force c. its rotational inertia d. angular momentum I think it is d - but I am unsure. Any advice?

    asked on July 22, 2008
  43. Math

    In science class, Savannah measures the temperature of a liquid to be 50^@ Celsius. Her teacher wants her to convert the temperature to degrees Fahrenheit. What is the temperature of Savannah's liquid to the nearest degree Fahrenheit?

    asked on November 16, 2015
  44. math

    An antique clock takes 5.5 seconds to chime at 3 o'clock. How long does it take to chime at 9 o'clock ? 5.5/2= 2.75x8=22seconds

    asked on March 4, 2015
  45. Thermodynamics

    a rigid vessel of volume 1m(^3) contains steam at 20bar and 400 degrees Celcius. The vessel is cooled until the steam is just dry saturated. Calculate the mass of steam in the vessel, the final pressure of the steam and the heat rejected during the

    asked on March 12, 2010
  46. physics

    You know that you can safely stand on the hang-over end of a heavy plank that rests on a table. How far depends on your mass and the mass of the plank. Suppose you can stand on the end of a plank that overhangs the edge of the supporting table 1/4 its

    asked on July 22, 2008
  47. Chemistry

    A sample of gas (2.0 mmol) effused through a pinhole in 5.0 s. It will take __________ s for the same amount of to effuse under the same conditions.

    asked on December 31, 2014
  48. chemistry

    What is the pressure in millimeters of mercury of 0.0115mol of helium gas with a volume of 211ml at a temperature of 25 degrees celsius? Ok so I've come up with many different answers but none are right. You convert the mL to L and the temperature to

    asked on February 20, 2013
  49. Calculus Antiderivative Problem

    A car traveling at 46 mph decelerates at 21 feet per second per second. a). How long does it take for the car to come to a complete stop? b). What distance is required to bring the car to a complete stop? An

    asked on November 8, 2013
  50. chemistry

    What mass of electrons would be required to just neutralize the charge of 1.4 of protons?

    asked on September 30, 2012
  51. Chemistry

    What happens when you mix ammonium chloride and sodium nitrate? I don't need any equations, just what would you see when you mix them together Thanks~

    asked on September 22, 2015
  52. Thermodynamics

    A turbine operating under steady flow conditions receives steam at the following state: pressure 13.8 bar, specific volume 0.143 m^3/kg, specific internal energy 2591kJ/kg and velocity 30m/s. The state of steam leaving the turbine is as follows: pressure

    asked on June 3, 2010
  53. English III

    Hello there! (: If someone could proofread this summary for me that would so great! In Bob Herbert’s column, “Tweet Less, Kiss More” he addresses the negative impact technology’s left on society today. He states how it affects focus, safety, and

    asked on August 11, 2012
  54. math

    Why do you have to use estimation to find the number of triangles you need for the string? {could you please me I don't understand

    asked on November 14, 2015
  55. Algebra 2

    Carla’s kitchen floor is in the shape of a perfect square. Her copycat brother, Carl, wants to re-model his kitchen so that it will have the same surface area as his sister, but his kitchen will be rectangular. The length of his floor is half the length

    asked on March 15, 2016
  56. Chemistry

    How many moles of gas must be forced into a 4.8L tire to give it a gauge pressure of 30.8psi at 30 degrees celsius? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.5L so that the total pressure in the tire is

    asked on February 20, 2013
  57. math

    2 boats left the harbour at the same time. One travelled at 10km/h on a course of 47 degrees. from the north. the other travelled 8km/h on a course of 79 degrees. how far apart were the boats after 45 minutes to th nearest tenth of a kilometre.

    asked on December 8, 2012
  58. chemistry

    A backpacker carries 3.0L of white gas as fuel for her stove. How many pounds does the fuel add to her load? Assume the density of white gas to be .79 g/cm^3

    asked on September 11, 2012
  59. Biology

    A bricklayer has an assistant who brings bricks to the bricklayer so she can build a wall. What part of translation most closely resembles the assistant's job? What do the bricks represent?

    asked on December 8, 2008
  60. Calculus

    Identify the maximum and minimum values of the function y = 8 cos x in the interval [–2π, 2π]. Use your understanding of transformations, not your graphing calculator.

    asked on November 15, 2018
  61. Physics

    What is the magnitude of the acceleration of a speck of clay on the edge of a potter's wheel turning at 44 rpm (revolutions per minute) if the wheel's diameter is 31 cm?

    asked on November 19, 2018
  62. physics

    The headlights, radio, and defroster fan in an automobile are connected in a. series with a switch for each. b. parallel with a switch for each. c. series without separate switches. d. parallel without separate switches. any help would be appreciated -

    asked on July 21, 2008
  63. Physics

    Two objects attract each other gravitationally with a force of 2.9 10-10 N when they are 0.35 m apart. Their total mass is 4.0 kg. Find their individual masses.

    asked on November 18, 2018
  64. algebra

    Determine the x-intercept and y-intercept of 3x - 6y = 12.(Points : 2) (9, 0) and (0, -3) (4, 0) and (0, -2) (-4, 0) and (0, 4)

    asked on February 3, 2012
  65. math

    What will the graph look like for a system of equations that has no solutions? A. The lines will be perpendicular. B. The lines cross at one point. C. Both equations will form the same line. D. The lines will be parallel. Is the answer B?? Thank you

    asked on April 30, 2015
  66. math

    There is a jar of 16 marbles. 4 red, 7 blue and 5 green. 1) What is the probability of selecting a red marble, REPLACING it, and then selecting a blue marble. 2) What is the probability of selecting a red marble, then SETTING IT ASIDEm then selecting a

    asked on May 24, 2013
  67. Chemistry

    The U.S. Food and Drug Administration lists dichloromethane (CH2Cl2) and carbon tetrachloride (CCl4) among the many cancer-causing chlorinated organic compounds. what are the partial pressures of these substances in the vapor above a mixture containing

    asked on October 18, 2010
  68. Geometry

    YW bisects angle XYZ. The measure of angle XYZ = 80 degrees. Find the measure of angle XYW

    asked on July 16, 2015
  69. Physics

    The cheetah can reach a top speed of 114 km/h (71 mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 46 m in a straight line, reaching a final speed of 83 km/h. (a) Determine the cheetah's average acceleration during the

    asked on September 14, 2012
  70. Geometry helpp!!

    Can anyone graph this please!!! 5. Perform these transformations on ∆TRL and compute the perimeter of the pre-image and final image. a. Rotate ∆TRL 180° about the origin and label the resulting image ∆T’ R’ L’. b. Reflect ∆T’ R’ L’

    asked on January 12, 2011
  71. Factor out the Greatest Common Factor (GCF)

    Factor out the Greatest Common Factor (GCF): 45d^3-18d^2

    asked on April 11, 2016
  72. chemistry

    the dissociation of molecular iodine into iodine atoms is represented as: I2 =2I Suppose that .0256 mole of I2 was placed in a 2.30 L flask at 1000K. what is the intial concentration of the I2 before any reaction occurs?

    asked on November 1, 2010
  73. Poetry/Iambic pentameter

    I'm supposed to write a poem in iambic pentameter and then scan it (with stressed and unstressed marks). However, I can't seem to figure out where to put the marks over the words / figure out how to do it with syllables. Any help would be appreciated,

    asked on February 5, 2007
  74. atlantic

    A car is designed to last an average of 12 years with a standard deviation of 0.8 years. What is the probability that a car will last less than 10 years?

    asked on April 6, 2017
  75. math

    There are some caps in a box. 1/6 of them are red, 1/3 of them are blue and 3/7 of the remainder are green. If there are 27 green caps, how many caps are there altogether? How should I solve this?

    asked on December 3, 2015
  76. chemistry

    Please be specific! Briefly explain whether each if the following procedural errors would result in a high, low, or an unchanged calculated mass of Ca2+ in the analyzed tablet. a)a student had difficulty decanting the supernatant solution from the test

    asked on October 15, 2012
  77. Math

    Jane is buying squid balls and noodles for her friends.Each cup of noodles costs Php 15 while each stick of squid balls costs Php 10.She only has Php 70 but needs to buy at least 3 stick of squid balls. A. Write a system of linear inequalities to model the

    asked on September 13, 2017
  78. Probability

    Let X be the number of successes in 25 independent trials with probability 1/10 of success in each trial. Let m be the most likely value of S. Find m.

    asked on March 31, 2013
  79. Geometry helpp!!

    Can anyone graph this please!!! 5. Perform these transformations on ∆TRL and compute the perimeter of the pre-image and final image. a. Rotate ∆TRL 180° about the origin and label the resulting image ∆T’ R’ L’. b. Reflect ∆T’ R’ L’

    asked on January 12, 2011
  80. plz help math

    The formula for the force between two objects is F=GMm/r^2 where M and m are the masses of the two objects, G is a constant, and r is the distance between them. Solve the formula for m .m=Fr^2/GM m=r^2/FGM m=GM/Fr^2 m=FGM/r^2

    asked on May 26, 2016
  81. Math

    Dixon and his little sister Ariadne stand next to each other on the playground on a sunny afternoon. Their mother measures their shadows. Dixon's shadow is 18 feet long and Ariadne's shadow is 15 feet long. If Dixon is 6 feet tall, how tall is Ariadne?

    asked on January 4, 2016
  82. PreAlgebra

    A scale drawing of a town park has a scale of 1 inch : 100 feet. What is the actual length for each 1 foot on the drawing? Thanks!

    asked on December 12, 2011
  83. Biology

    Okay, I need help. "If short hair (L) is dominant to long hair (l), then what fraction of the offspring produced by a cross of Llxll will be homozygous dominant? a) 1/2 b) 1/4 c) 1/3 d) none (no change of this offspring) The key says that it's d, but when

    asked on November 17, 2009
  84. Social Studies

    What are some reasons that Rome was able to take over italy? A.Bc Rome was mountainous B.Bc the romans won wars over neigboring city states C. Bc the Romans weren't good fighters D. bc italy was pretty flat making it easier to get from place to place I

    asked on March 25, 2019
  85. calculus

    An airplane flies at an altitude of 5mies toward a point directly over an observer. The speed of the plain is 600 miles per hour. Find the rate at which the angle of elevation thetha is changing when the angle is 75 degrees. Please help with this question.

    asked on January 19, 2012
  86. Precalculus

    Show the first three terms of each related sequence or series and solve each problem. 1) Jerry hopes to buy a camera which costs $680. He plans to save $5 more each month than in the month before, beginning with $5 this month. In how many months will he

    asked on November 12, 2015
  87. Spelling

    Here are the words that I have to unscramble to form a sentence. It seems like it might be missing a word. disease contagious could not he doctor his conceal from... I can only come up with a sentence if I add an extra "his". The rules do not say to add an

    asked on March 3, 2013
  88. Math

    two boats leave the same port at the same time. one travels at a speed of 29 mph in the direction N 50 degrees E and the other travels at a speed of 35 mph in the direction S 70 degrees E. how far apart are the two boats after an hour.

    asked on October 28, 2015
  89. American History

    What principles of American foreign policy did the Berlin airlift put into action? What do you think might have happened if the U.S. and Britain had not tried the airlift or if the airlift had failed?

    asked on March 17, 2013
  90. Maths

    Solve the differential equation: d2y/dx2 - 2 dy/dx + y = 3sinhx The answer should be: y(x) = e^x (Ax+ B) + ( 3^8 )(2[x^2][e^x] - [e^-x] ) Can someone please show me how to work it out?

    asked on November 30, 2009
  91. English

    The poem small passing by I grid de kok is free verse so has no structure, but I am not sure what sound device is used to creat rhythm and form? Please help

    asked on August 29, 2016
  92. physics

    Two charges separated by one meter exert 1 Newton forces on each other. If the magnitude of each charge is doubled, the force on each charge is ______ Newtons. Thanks!

    asked on July 20, 2008
  93. Math

    Ronald need to earn at least Php 2,500 from his two jobs to cover his weekly expenses.This week,he can work for at most 42 hours.His job as a gas station attendant pays Php 52.50 per hour while his job as parking attendant pays Php 40 per hour. A. Write a

    asked on September 13, 2017
  94. math

    Elimination was used to solve a system of equations. One of the intermediate steps led to the equation 9x=27 . Which of the following systems could have led to this equation? 4x+3y=24 −5x−3y=3 7x−2y=15 x+y=6 9x+2y=21 −9x−2y=21 10x−y=15

    asked on May 26, 2016
  95. math

    Video Villa rents classic video games for $2.50 for 5 days. New games rent for $3.50 for 5 days. If Rob rents c classic games and n new games, what is his cost per day, in dollars, for renting the games for 5 days? Select one: a. 0.50c+0.70n b. 0.50c+0.75n

    asked on May 13, 2016
  96. chemistry

    Given: H2 (g) + O2 (g) ⇌ H2O2 (g) K = 2.3 x 106 at 600 K 2 H2 (g) + O2 (g) ⇌ 2 H2O (g) K = 1.8 x 1037 at 600 K Calculate Gº for the following reaction: H2O (g) + 1/2 O2 (g) ⇌ H2O2 (g)

    asked on May 3, 2010
  97. Physics

    When William Tell shot the apple off his son's head, the arrow remained stuck in the apple, which means the collision between the arrow and apple was totally inelastic. Suppose that the velocity of the arrow was horizontal at 75 m/s before it hit, the mass

    asked on April 12, 2009
  98. Social Studies

    What geographic features helped Rome to prosper? A. Mountains B. Plateaus C. Desert D. Rivers E. Plains F. Location away from the sea guys plzz answer fast i really need help >.

    asked on March 25, 2019
  99. Phonemes

    I just wanted check my phonemes' division cow -c/ow (2 phonemes) tree- t/r/E (3) shopping - sh/o/p/i/ng (5) matter - m/a/t/e/r/ (5) gutters- g/u/t/e/r/s (6) horse h/o/r/se (4) car- c/a/r (3) chart /ch/a/r/t (4) see - s/e (2) saw- s/aw (2) sawing- s/aw/i/ng

    asked on March 12, 2013
  100. Chemistry

    For 2 SO2(g) + O2(g) 2 SO3(g), Kp = 3.0 104 at 700 K. In a 2.00-L vessel the equilibrium mixture contains 1.58 g of SO3 and 0.136 g of O2. How many grams of SO2 are in the vessel?

    asked on October 20, 2012


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