Popular questions and responses by melissa
  1. probabilty

    In a school, 14% of students take drama and computer classes, and 67% take drama Class. What is the probabilty that a students takes computer class given that the student takes drama class? i have no idea how to work this so please show me your work.

    asked on March 19, 2009
  2. math

    determine the value of k such that g(x)=3x+k intersects the quadratic function f(x)=2x^2-5x+3 at exactly one point determine the value(s) of k such that the linear function g(x)=4x+k does not intersect the parabola f(x)=-3x^2-x+4

    asked on October 24, 2011
  3. Chemistry- helpp!

    The equation for synthesis of the poisonous gas COCl2 is CO(g) + Cl2(g)COCl2 If 43.2 kJ of energy is evolved when 39.5 g of COCl2 is synthesized, what is the molar enthalpy for this synthesis? THANK YOU!

    asked on November 2, 2010
  4. calculus

    Make a substitution to express the integrand as a rational function and then evaluate the integral. (Use C for the constant of integration.) 1/x{(x-1)^1/2} dx

    asked on April 6, 2017
  5. physics

    The distance between the second and sixth crests in a wave is 75cm and one crest travels a distance of 25 cm in 3.0s . Find the frequency of the wave

    asked on June 6, 2012
  6. forces

    Two teams of nine members each engage in a tug of war. The first team's members have average masses of 64 kg and exert average forces of 1350 N horizontally. The second team's members have average masses of 69 kg and exert average forces of 1365 N

    asked on February 8, 2014
  7. Chemistry

    You are a work study student in our chemistry department. Amy, your supervisor has just asked you to prepare 250ml of 2.00M H2SO4 solution for tomorrow's undergraduate experiment. The Stock Solutions cabinet is under the Stockroom Explorer. You will find

    asked on July 10, 2014
  8. Calculus - Rates of Change

    A water tank has a shape of an inverted cone with a base radius of 2m and a height of 4 m. If water is being pumped into the tank at a rate of 2m3/min, then find the rate at which the water level is rising when the water is 3m deep. Attempted solution: V=

    asked on March 7, 2016
  9. physics

    A particular guitar string is supposed to vibrate at 210Hz , but it is measured to vibrate at 220Hz By what percent should the tension in the string be changed to correct the frequency?

    asked on December 13, 2012
  10. Math( help please ! )

    The profit p(x) of a cosmetics company , in thousands of dollars,is given by p(x)=-5x^2+400x-2550, where x is the amount spent on advertising , in thousands of dollars a) determine the max profit the company can make b)Determine the amount spent on

    asked on October 17, 2011

    Write formulas for the compounds that form from In and each of the following polyatomic ion: NO−3, SO2−4, PO3−4. (Assume In charge is 3+.) InNo9, InSO6, AND InP4 is wrong

    asked on June 24, 2016
  12. math

    a ball is dropped from a height of 3m and bounces on the ground . At the top of each bounce, the ball eaches 60% of its previous height. Calculate the total distance travelled by the ball when it hits the ground for the fifth time

    asked on December 17, 2011
  13. physics

    A 160kg horizontal beam is supported at each end. A 330kg piano rests a quarter of the way from one end. What is the vertical force on each of the supports?

    asked on November 27, 2012
  14. Math

    Find the area under the standard normal curve to the right of z = -1.25.

    asked on December 9, 2009
  15. physics

    An archer locks a 0.20kg arrow on a bowstring. Then the archer exerts an average force of 110N to draw the string back 0.60 m . Assume that friction is negligible . What speed does the bow give to the arrow? If the arrow is shot vertically upward,how high

    asked on April 30, 2012
  16. physics

    A child throws a ball with an initial speed of 8 m/s at an angle of 40 degrees above the horizontal. The ball leaves her hand 1 m above the ground. How long is the ball in flight before it hits the ground? What is the magnitude of the ball's velocity just

    asked on September 19, 2010
  17. chemo

    How much heat (in kJ) does it take to melt 28.4 grams of ice at 0 °C and raise the temperature of the resulting water to 25 °C? Heat of fusion 334 J/g, Specific heat 4.184 J/g °C ?

    asked on October 29, 2013
  18. Physics!! Help!!!!!

    A wire of length L and cross-sectional area A has resistance R. What will be the resistance R_stretched of the wire if it is stretched to twice its original length? Assume that the density and resistivity of the material do not change when the wire is

    asked on February 15, 2012
  19. math

    A farmer has 90 meters of fencing and would like to use the fencing to create a rectangular garden where one of the sides of the garden is against the side of a barn. Let L represent the varying length of the rectangular garden (in meters) and let A

    asked on September 2, 2018
  20. Chemistry

    What mass, in grams, of sodium carbonate is required for complete reaction with 8.35g of nitric acid to produce sodium nitrate, carbon dioxide, and water? [Show work]

    asked on February 12, 2014
  21. Math

    4 letters are typed, without repetition. What is the probability that all 4 will be vowels? Write your answer as a percent. Round your answer to three decimal places.

    asked on November 19, 2017
  22. algebra

    Write a rule in words and as an algebraic expression to model the relationship in each table. The local video store charges a monthly membership fee of $5 and $2.25 per video. 1 video is $7.25 2 videos are $9.50 3 videos are $11.75

    asked on August 27, 2012
  23. Math !!!!!

    a function f(x)has doamin {xeR/x>-4} and range {yeR/y

    asked on September 24, 2011
  24. Math

    4 letters are typed, with repetition allowed. What is the probability that all 4 will be vowels? Write your answer as a percent. Round to the nearest hundredth of a percent as needed.

    asked on November 19, 2017
  25. physics

    A 50.0kg cyclist on a 10.0kg bicycle speeds up from 5.0m/s to 10.0m/s , the total kinetic energy before acceleratingis 750, and after acceleratingis 3000, how much work is done to increase the kinetic energy of the cyclist and the bicycle

    asked on April 27, 2012
  26. physics

    The distance between successive crests in a series of water waves is 5.0m; the crests travel 8.6m in 5.0s . Calculate the frequency of a block of wood bobbing up and down in the water

    asked on June 18, 2012
  27. Chemistry

    I am doing a lab online and have no clue on how to get started with the following questions? Please Help me! 1. Calculate and record the following (in grams): (a) mass of NaCl by subtraction of other components: (b) measured mass of NaCl after boiling away

    asked on October 23, 2010
  28. geography

    what are the results/effects of poor service delivery socially,environmental and economic problems?

    asked on May 1, 2016
  29. physics

    The third resonant length of a closed air column is 75cm . What is the first and second length

    asked on June 5, 2012
  30. Chemistry

    convert: 450m/s to m/h? please show exact steps

    asked on August 24, 2009

    Write formulas for the compounds that form from Sr and each of the following polyatomic ion: NO−3, SO2−4, PO3−4. APPARENTLY SrNO6, SrSO4 , Sr3PO8 is wrong

    asked on June 24, 2016
  32. Investments

    Melissa Popp is thinking about buying some shares of R.H. Lawncare Equipment, at $48 per share. She expects the price of the stock to rise to $60 over the next 3 years. During that time she also expects to receive annual dividends of $4 per share. A. What

    asked on April 15, 2014
  33. Finance

    Aset P has a beta of 0.9. The risk-free rate of return is 8%, while the return on the S&P 500 is 14%. Asset P's required rate of return is:

    asked on June 17, 2012
  34. physics

    A 200m dash along a straight track was timed at 21.1 s by a timer located at the finish line who used the flash from the starters pistol to start the stopwatch. If the air temperature was 30.0c , what would the time have been if the timer had started the

    asked on May 20, 2012
  35. Math

    a teacher asked her students to think of a number, multiply by 5, and subtract the product from 20 , then she asked them to multiply the resulting difference by the number they first thougt of a) use function notation to express the final answer in terms

    asked on September 22, 2011

    A piece of wood is floating at the surface of some water as illustrated (the diagram is not to scale). The wood has a circular cross section and a height h = 4.0 cm. The density of water is 1.00 g/cm3. The distance y from the surface of the water to the

    asked on August 9, 2011
  37. Physics

    Two very small spheres are initially neutral and separated by a distance of 0.50 m. Suppose that 2.50 x 10^13 electrons are removed from one sphere and placed on the other. What is the magnitude of the electrostatic force that acts on each sphere?

    asked on September 26, 2010
  38. Chemistry

    I am really having trouble answering this question, can someone help? A binary compound between an unknown element E and hydrogen contains 91.27% E and 8.73% H by mass. If the formula of the compound is E3H8, calculate the atomic mass of E.

    asked on September 12, 2010
  39. Geometry

    Can you help me with Always, Sometimes, Never questions?? I have answered all of these, but I am not sure if they are right. 1. The base angle of an isosceles triangle are acute----Always 2. When the altitude and the median are drawn from the same vertex

    asked on May 28, 2013
  40. american government

    judicial review is the power of the american courts to:

    asked on January 21, 2013
  41. math concepts and applications

    A rectangle has a length of 6 meters and a perimeter of 20 meters. What is the width of the rectangle? A. 4 meters B. 7 meters C. 14 meters D. 52 meters C ?

    asked on August 15, 2012
  42. physics

    Some children go tobogganing on an icy hill. The start from the rest at the top of the hill. The toboggan and children have a combined mass of 94 kg. The height of the first hill a is 12.0m the height of b is 0, and the height of c is 3.0m. If friction is

    asked on June 15, 2012
  43. physics

    What's the shortest air column , closed at one end, that will resonate at a frequency of 440.0Hz when the speed of sound is 352 m/s

    asked on June 5, 2012
  44. math

    a student plants a seed, after the speed sprouts the student monitors the growth of the plant by measuring its height every week, the height after each of the first tree wees was 7mm , 20mm, and 33mm, respectively, if this pattern of growth continuesinwhat

    asked on January 3, 2012
  45. Chemistry

    Calculate the molar solubility of MgF2 in 0.08M MgCl2 at 25 degrees C.

    asked on February 8, 2011
  46. Chemistry

    Fungal laccase, a blue protein found in wood-rotting fungi, is 0.390% Cu by mass. If a fungal laccase molecule contains four copper atoms, what is the molar mass of fungal laccase?

    asked on September 11, 2010
  47. Chemistry

    Write the chemical formulas for the compounds containing each of the following: a) one calcium atom for every two iodide atoms. b) two nitrogen atoms for every four oxygen atoms. c) one silicon atom for every two oxygen atoms. d) one zinc atom for every

    asked on July 1, 2010
  48. ratio

    In a school with 560 students, the ratio of students to teacher is 20 to 1. How many new teachers need to be hired to reduce the ratio to 16 to 1?

    asked on March 9, 2009
  49. psychology

    Which of the following characteristics is associated with sense of hardiness? -Pessimism - Believing in fate, destiny, and luck - Expecting positive outcomes - Viewing stressors as challenges are met - Type B behavior pattern I think it's the second or

    asked on November 19, 2008
  50. physics

    the cener mass of an object (a)always lies at the center of the object (b) is at the location of the most massive partical in the object (c)always lies within the object, or (d) none of the preceding

    asked on February 4, 2008
  51. Chemistry

    In the following reaction, first find how many oxygen molecules would be used to completely react with 230 grams of pentyl alcohol (C5H11OH)? Then, if exactly 1.505x10^21 carbon dioxide molecules were formed in this reaction, calculate the grams of water

    asked on November 24, 2017
  52. Chemistry

    In the following reaction, first find how many oxygen molecules would be used to completely react with 230 grams of pentyl alcohol (C5H11OH)? Then, if exactly 1.505x10^21 carbon dioxide molecules were formed in this reaction, calculate the grams of water

    asked on November 24, 2017
  53. Chemistry

    In the following reaction, first find how many oxygen molecules would be used to completely react with 230 grams of pentyl alcohol (C5H11OH)? Then, if exactly 1.505x10^21 carbon dioxide molecules were formed in this reaction, calculate the grams of water

    asked on November 24, 2017

    Provide the name of the oxyanion of the acid HNO2(aq) I ENTERED Carbonate ion BUT ITS WRONG

    asked on June 24, 2016
  55. Physics

    Viscous blood is flowing through an artery partially clogged by cholesterol. A surgeon wants to remove enough of the cholesterol to double the flow rate of blood through this artery. If the original diameter of the artery is D , what should be the new

    asked on April 23, 2012
  56. Math

    the height of a rocket above the ground is modelled by the quadratic function h(t)=-4t^2+32t a) how long will the rocket be in the air ? how do you know? b) what is the maximum height that the rocket will reach ?

    asked on October 13, 2011
  57. spanish

    do any of these words have accents? (if so please identify them): - abrigo - rapido - sabado - vez - menu - operacion - impermeable - ademas - regatear - antipatico - farmacia - esqui - pension - pais - perdon

    asked on February 17, 2011
  58. Chemistry

    A mixture contains only NaCl and Al2(SO4)3. A 1.45-g sample of the mixture is dissolved in water and an excess of NaOH is added, producing a precipitate of Al(OH)3. The precipitate is filtered, dried, and weighed. The mass of the precipitate is 0.107 g.

    asked on September 18, 2010
  59. math

    what do you call a duck that steals

    asked on January 12, 2010
  60. physics

    In an emergency stop to avoid an accident,a shoulderstrap seat belt holds a 60-kg passenger firmly in place. If the car were initally traveling at 90 km/h and came to a stop in 5.5s along a straight, level road, what was the average force applied to the

    asked on January 17, 2008
  61. accounting

    The Delicious Cake Factory owns a building for its operations. Delicious uses only half of the building and is considering two options that have been presented to them. The Candy Store would like to purchase the half of the building that is not being used

    asked on June 29, 2008
  62. Microeconomics

    If a firm has a U-Shaped long-run average cost curve, a.) its fixed cost rises as output rises. b.) it must have increasing returns to scale at low levels or production and decreasing returns to scale at high levels of production. C.) it must have

    asked on October 30, 2006
  63. physics

    two forces are of magnitude 450N and 240N respectively determine the maximum magnitude of the resultant force.

    asked on September 23, 2019
  64. physics

    Superman is said to be able to ''leap buildings in a single bound'' How high a building could Superman jump over if he were to leave the ground with speed of 98.0 m/s at an angle of 87.0 degrees to the horizontal?

    asked on October 28, 2018
  65. Chemistry

    How many grams of dichloromethane are formed from 1500.0 grams of methane, it the percent yield for the reaction is 82.5%?

    asked on November 24, 2017

    Write formulas for the compounds that form from Sr and each of the following polyatomic ion: NO3 −1, SO4 −2, PO4 −3. SR (+3 CHARGE) NO3(-1 CHARGE) SO4(-2 CHARGE) PO4(-3 CHARGE) Re posting this question. hopefully someone can help me answer this now.

    asked on June 24, 2016
  67. Math

    Suppose that people's heights (in centimeters) are normally distributed, with a mean of 170 and a standard deviation of 5. We find the heights of 60 people. (You may need to use the standard normal distribution table. Round your answers to the nearest

    asked on December 1, 2015
  68. Algebra

    In the slideshow, Multiplication of rational expressions, located in Chapter 6, the answer results in x in the numerator and x – 5 in the denominator. True or False

    asked on August 10, 2015
  69. Chemistry

    Benzene, C6H6, reacts with nitric acid, HNO3. Two products are formed, one of which is water. The second product has a molar mass of 213 grams. The second product is composed of 33.8% carbon, 1.42% hydrogen, 19.7% nitrogen, and 45.1% oxygen. Write a

    asked on April 17, 2015
  70. skills ,concepts and atitude

    Animal observation and investigations usually begin with A. handling the animal. B. a guiding question. C. feeding the animal. D. an outline of animal behavior. my answer is d.

    asked on March 8, 2015
  71. Spelling

    What does VCCV and VCV mean in 4th grade words?

    asked on March 17, 2014
  72. Science

    Can someone please check my answers and if they are wrong can you help me fix them? Thank so much!! 1. Which of the following determines the strength of the force of gravity between two objects? Check all that apply. (2 points) the speeds of the objects

    asked on January 24, 2014
  73. college physics

    A commuter backs her car out of her garage with a constant acceleration of 1.20 m/s2. (a) How long does it take her to reach a speed of 1.60 m/s? s (b) If she then brakes to a stop in 0.8 s, what is her (constant) deceleration?

    asked on January 23, 2014
  74. Physics

    Light with a wavelength of 500 nm (5. 10-7 m) is incident upon a double slit with a separation of 0.44 mm (4.40 10-4 m). A screen is located 2.1 m from the double slit. At what distance from the center of the screen will the second dark fringe beyond the

    asked on April 5, 2013
  75. math

    State a trigonometric ratio that is equivalent to each of the following trigonometric ratios Sin 3pie/10 Cos 6pie/7

    asked on November 10, 2012
  76. World Geography

    What human and physical features influence the size and distribution of settlements?

    asked on October 4, 2012
  77. math

    Each dividend was divided by another polynomial, resulting in the given quotient and remainder. Find the divisor Divided:5x^3+x^2+3 ,quotient:5x^2-14x+42, remainder:-123

    asked on September 28, 2012
  78. vocabulary

    zestFUL remorseFUL A) result of B)place for C)capable of D)filled with i think its c choose the word or phase that gives the best meaning of the underlined prefix or suffix.

    asked on August 14, 2012
  79. physics

    An object falls from the top of the school, which is 6.06m high. Assume air resistance can be ignored and the acceleration is 9.8m/s^2 If the object was dropped( not thrown) , what is its speed after 0.333s How long does it take to hit the ground

    asked on June 13, 2012
  80. math

    B=1.69 (sqrt (s)+4.45)-3.49 solve for s

    asked on February 16, 2012
  81. Precalculus

    Which of the following is a solution for the equation 1/485tan^2x = 0? a) pi b) pi/2 c) 485pi d) no solution Which of the following is NOT a solution to the equation 4sin^2x = 1 for 0≤x≤2pi? a) 30 degrees b) 210 degrees c) 150 degrees d) 120 degrees?

    asked on January 27, 2012
  82. Math

    The diameter of a car's tire is 60cm . While the car is being driven , the tire picks up a nail .How high above the ground is the nail after the car has travelled 1km

    asked on December 8, 2011
  83. math

    The sum of two numbers is 16 . What is the largest possible product between these numbers

    asked on October 22, 2011
  84. Math( help please ! )

    The height of a ball thrown vertically upward from a rooftop is modelled by y=-5t^2+20t+50 , where h(t) is the ball's height above the ground , in meters , at time t seconds after the throw a) Determine the max height of the ball b) how long does it take

    asked on October 17, 2011
  85. Calculus 3

    Find the average value of the squared distance between the origin and points in the solid paraboloid D={ (x,y,z): 0 ≤ z ≤ 4 - x^2 - y^2} I have no idea how to start this.

    asked on May 6, 2011
  86. Algebra

    One canned juice is 20% orange juice: another is 10% orange juice. How many liters of each should be mixed together in order to get 10L that is 13% orange juice.How many liters of the 20%? How many liters of the 10%?

    asked on November 13, 2010
  87. math

    How many capsules, each containing 250mg, are needed to provide 50mg/kg/day for 10 days for a person weighing 176 pounds?

    asked on March 1, 2008
  88. physics

    The center of a 4.0 kg sphere and a 7.5 kg sphere are separated by a distance of 1.5 m where is the center of mass of the two sphere system

    asked on February 4, 2008
  89. Physical Science

    You push a refrigerator with a force of 50 N and it moves 3 meters across the floor. How much work is it?

    asked on May 5, 2020
  90. Chemistry

    How many grams of KI are in 25.0 ml of a 3.0% (m/v) solution?

    asked on October 29, 2019
  91. word problem

    can anyone please show me how to set this up? This basketball season, Armando scored 8 less points than Austin, Damien scored twice as many points as Austin, and Brian scored 5 more than 5 times as many points as Austin. If all 4 players scored a total of

    asked on May 5, 2017
  92. Pre Calc - Probability

    Let S = {2, 8, 14} be a sample space associated with an experiment. (a) List all events of this experiment. A) {2, 8}, {2, 14}, {8, 14}, {2, 8, 14} B) {2}, {8}, {14}, {2, 8}, {2, 14}, {8, 14} C) {2}, {8}, {14}, {2, 8}, {2, 14}, {8, 14}, {2, 8, D) 14} E)

    asked on January 11, 2017
  93. Calc 2 Urgent Surface Area

    Find the area of the surface generated when y=4x and x=1 is revolved about the y-axis. We have to use the surface area formula.

    asked on December 14, 2016
  94. Math

    You estimate that a puppy weighs 12 pounds. The actual weight of the puppy is 14 pounds. Find the percent error. Round your answer to the nearest hundredth of a percent. Help me Im stuck..!

    asked on February 29, 2016
  95. Math

    If 5X + x squared > 100 then x is not equal to

    asked on July 16, 2015
  96. Science

    90 calories of heat is added to 1 gram of fresh water with an initial temperature of 10 degrees Celcius. What is the final temperature of this liquid? (latent heat of fusion = 80cal/g°C, latent heat of vaporization = 540 cal/g°C)

    asked on February 26, 2015
  97. UV

    the two lenses in contact are 45 cm away from the object and the distance of the object from the image is 110 cm. if one of the two lenses in contact has a focal length of 15cm, what is the focal length of the second lens? thanks :)

    asked on March 8, 2014
  98. Physics

    A test charge of +3.00 10-6 C experiences a downward electrostatic force of 11 N when placed at a certain point in space. What are the magnitude and direction of the electric field at this point?

    asked on March 18, 2013
  99. chemistry

    I am supposed to add NH4 and C2H3O2 together and write the new ion. Would it be NH7C2O2? do I add the hydrogens together and were would it go in the order then?

    asked on February 5, 2013
  100. Physics

    A sound wave is traveling in warm air when it hits a layer of cold, dense air. If the sound wave hits the cold air interface at an angle of 23 degree angle, what is the angle of refraction? Assume that the cold air temperature is -10 degrees C and the warm

    asked on December 13, 2012


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