Steven

Most popular questions and responses by Steven
  1. Math

    A 100 point test contains a total of 20 questions. The multiple choice questions are worth 3 points each and the short response answer questions are worth 8 pints each. Write a system of linear equations that represents this situation, my answer is to

    asked on May 6, 2016
  2. statistics

    in a test for esp a subject is told that cards the experimenter can see but he cannot contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is

    asked on March 24, 2010
  3. math

    For the curve given by 4x^2+y^2=48+2xy, show that there is a point P with x-coordinate 2 at which the line tangent to the curve at P is horizontal.

    asked on December 31, 2014
  4. Geometry PLEASE HELP ME

    ABC has vertices A(0, 6), B(4, 6), and C(1, 3). Sketch a graph of ABC and use it to find the orthocenter of ABC. Then list the steps you took to find the orthocenter, including any necessary points or slopes you had to derive.

    asked on December 11, 2012
  5. Math

    The twice–differentiable function f is defined for all real numbers and satisfies the following conditions: f(0)=3 f′(0)=5 f″(0)=7 a)The function g is given by g(x)=e^ax+f(x) for all real numbers, where a is a constant. Find g ′(0) and g ″(0) in

    asked on December 29, 2014
  6. Science

    1. How does sea-floor spreading occur? A. New materials are being added to the asthenosphere. B. Earthquakes brake apart the ocean floor. C. Sediments accumulate at the area of spreading. D. Molten material beneath Earth's crust rises to the surface.*

    asked on April 22, 2014
  7. Physics

    A 38.0-kg boy, riding a 2.37-kg skateboard at a velocity of +5.07 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.06 m/s, 10.35° above the

    asked on October 15, 2014
  8. Physics

    A total of 8.0 joules of work is done when a constant horizontal force of 2.0 newtons to the left is used to push a 3.0 kilogram box across a counter top. Determine the total horizontal distance the box moves.

    asked on January 16, 2012
  9. PHYSICS

    A spinning wheel on a fireworks display is initially rotating in a counterclockwise direction. The wheel has an angular acceleration of -3.80 rad/s2. Because of this acceleration, the angular velocity of the wheel changes from its initial value to a final

    asked on November 14, 2008
  10. Discrete Math

    A bag contains 5 red marbles, 4 yellow marbles, 3 green marbles, 2 orange marbles and 2 purple marbles. If three marbles are removed, what is the probability that at least one of them is red?

    asked on January 19, 2014
  11. statistics

    a binomial distribution will be approximately correct as a model for one of these two sports settings and for the other. explain why by briefly discussing both settings. a)a national football league kicker has made 80% of his field goal attempts in the

    asked on March 24, 2010
  12. Chemistry

    A 25.40 g sample of water containing tritium,(3/1)H , emits 1450 beta particles per second. Tritium is a weak beta emitter, with a half-life of 12.3 yr. What fraction of all the hydrogen in the water sample is tritium?

    asked on February 13, 2012
  13. Physics

    The pilot of an aircraft wishes to fly due west in a 50.0 km/h wind blowing toward the south. The speed of the aircraft in the absence of a wind is 228 km/h. a) How many degrees from west should the aircraft head? Let clockwise be positive. Answer in units

    asked on October 15, 2014
  14. Chemistry

    Calculate the percent ionization of 0.120 M lactic acid (Ka=1.4*10^-4).

    asked on March 2, 2012
  15. physics

    4. A ball is thrown so that it just clears a 3m fence 18m away. If it left the hand 1.5m above the ground and at an angle of 60° with the horizontal, what was the initial velocity of the ball?

    asked on March 10, 2015
  16. math

    Leslie has been offered the choice of either a $1,000 rebate or a 5.5 percent, 48-month loan for the new car she is purchasing. If Leslie will be financing $15,000 and she can get a 7.5 percent, 48-month loan at her credit union, should she take the $1,000

    asked on August 5, 2012
  17. Chemistry

    Cobalt-60, which undergoes beta decay, has a half-life of 5.26 yr. How many beta particles are emitted in 190s by a 3.10mg sample of Co-60? What is the activity of the sample in Bq?

    asked on February 13, 2012
  18. Physics

    The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a

    asked on October 3, 2014
  19. math

    After a drought, the Great Salt Lake in Utah covered an area of 2450 kilometers squared or 35/64 the area of the lake under normal weather conditions. Find the area of Great Salt Lake under normal weather conditions.

    asked on February 3, 2017
  20. chemistry

    A viral preparation was inactivated in a chemical bath. The activation process was found to be first order in virus concentration. The beginning of the experiment 2% of the virus was found to be inactivated per minute. [i] Evaluate k for the inactivation

    asked on November 11, 2015
  21. Physics

    The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a

    asked on October 3, 2014
  22. reading

    what assonance is in the poem daffodils by william-wordsworth?

    asked on October 25, 2013
  23. Physics

    Bats chirp at a high frequency which humans cannot hear. They use the echoes to detect small objects, such as insects, as small as one wavelength. If a bat were to emit a chirp at a frequency of 60.0 kHz and the speed of sound waves in the air are 340 m.s,

    asked on March 19, 2014
  24. Chemistry

    For the combustion of acetylene: 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g) ΔH = -2511 kJ What is the enthalpy change when 2.80 g of C2H2 (g) reacts with excess oxygen.

    asked on October 29, 2017
  25. Chemistry

    A 50.6 mg sample of sodium perchlorate contains radioactive chlorine-36 (whose atomic mass is 36.0 amu). If 29.6% of the chlorine atoms in the sample are chlorine-36 and the remainder is naturally occurring nonradioactive chlorine atoms, how many

    asked on February 13, 2012
  26. Physics

    For this problem, ignore air resistance. You are to fire a rifle that shoots a particular bullet at 460 m/s at a target that is 45.7 m away and level with the rifle. Assuming that the acceleration due to gravity is 9.80 m/s², how high above the target

    asked on October 6, 2010
  27. grade 11 math

    a uniform-width boardwalk is built around the inside edge of a rectangular parkland that is 10m by 15 m. if the boardwalk takes up 20% of the lot, how wide is the boardwalk to the nearest centimetre?

    asked on July 7, 2009
  28. Chemistry

    what is the chemical equation of copper II oxide and carbon monoxide (include phases)?

    asked on March 9, 2012
  29. APUSH

    how did huge industrial trusts develop in industries such as steel oil and banking, what was the effect on the economy?

    asked on January 24, 2012
  30. statistics

    we developed a 95% z confidence interval for the mean BMI of women aged 20 to 29 years, based on a national random sample of 654 such women. we assumed there that the population standard deviation was known to be 7.5. in fact the sample data had mean BMI

    asked on April 20, 2010
  31. Math 12

    A hard rubber ball is dropped from a moving van with a height of 5 metres. The ball rises to 80% of the previous height after each bounce. a) determine the total vertical distance the ball has traveled when it strikes the ground the eighth time. b)

    asked on May 11, 2012
  32. Multiple Choice

    Physics 2. Which of the following is equivalent to one ampere? (Points : 1) 10 s/10 C 10 C/10 m 1.5 C/1.5 s 15 C/10 s Question 3.3. A stream of moving charges results in a current of 5.6 A. How long does 116 C of charge take to flow past a fixed point?

    asked on May 8, 2014
  33. math

    For what values of x is the graph y=2/(5-x) concave upward? x-5 x>5 no values of x

    asked on February 2, 2015
  34. Organic chemistry: dehydrohalogenation

    Hello. I know you guys don't do organic chemistry but because I got so much help from you guys in general chemistry, I was wondering if you guys can help me out again. :P Here's my question. In dehydrohalogenation, how do you know whether a reaction is E1

    asked on October 10, 2007
  35. chemistry

    What volume of 0.123 M K3PO4 is required to react with 60 mL of 0.862 M MgCl2 according to the equation 2K3PO4+3MgCl2--> Mg3(PO4)2+6KCl Answer in units of mL.

    asked on March 10, 2010
  36. math

    For the curve given by 4x^2+y^2=48+2xy show that ((dy)/(dx))=(y-4x)/(y-x)

    asked on December 31, 2014
  37. Chemistry

    Complete and balance the following equation: NO2{-} + Cr2O7{2-} = Cr{3+} + NO3{-}

    asked on April 16, 2012
  38. math

    For the curve given by 4x^2+y^2=48+2xy, find the positive y-coordinate given that the x-coordinate is 2.

    asked on December 31, 2014
  39. college chemistry

    Copper(II) sulfide reacts with oxygen to produce copper (II) oxide plus sulfur dioxide. Suppose you start this reaction with 50.0 grams of copper(II) sulfide and 50.0 grams of oxygen and you actually produce 33.5 grams of copper(II) oxide. Calculate the

    asked on March 5, 2014
  40. math

    Last year's computer model is on sale for $799. You can add more memory to the computer. Each chip of 8 megabytes of memory costs $25. How many megabytes of memory can you add if you have at most $1,000 to spend.

    asked on March 1, 2011
  41. calculus-- need help desperately!

    The Taylor series about x=5 for a certain function f converges to f(x) for all x in the interval of convergence. The nth derivative of f at x=5 is given by f^(n) (5)= (-1)^n(n!)/((2^n)(n+2)), and f(5)=1/2. Write third degree Taylor polynomial for f about

    asked on March 17, 2007
  42. Chemistry

    Consider the voltaic cell illustrated in the figure, which is based on the cell reaction: Zn(s)+Cu^2+(aq) -> Zn^2+(aq)+Cu(s) Under standard conditions, what is the maximum electrical work, in joules, that the cell can accomplish if 52.0g of copper is

    asked on April 16, 2012
  43. math

    Salma's penny bank is 1/2 full. After she adds 360 pennies, it is 4/5 full. How many pennies can Salma's bank hold?

    asked on March 30, 2012
  44. algebra

    Who saw the brontosaurus enter the restaurant

    asked on May 21, 2011
  45. math

    A rectangular field is to be enclosed by a fence. Two fences parallel to one side of the field divide the field into three rectangular fields. If 2400m of fence are available find the dimensions giving the max area.

    asked on July 12, 2009
  46. Physics

    A 7300-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the

    asked on October 3, 2014
  47. chemistry

    Prepare 1.5 liters of 0.25 M Tris buffer, pH 7.5. Useful information: pKa Tris = 8.1 Formula weight of Tris (hydroxymethyl aminomethane) base = 121.1 Formula weight of Tris hydrochloride (acid form) = 158.0

    asked on September 26, 2012
  48. Statistics

    Cola Corporation produces Orange Cola. The filling machines are adjusted to pour 12 ounces of soda into each 12-ounce can. However, the actual amount of soda poured into each can is not exactly 12 ounces; it varies from can to can. It has been observed

    asked on February 19, 2013
  49. Physics

    The wind exerts a force of 284 N North on a sailboat, while the water exerts a force of 132 N West on the sailboat. What is the magnitude of the net external force on the sailboat? Answer in units of N

    asked on October 27, 2011
  50. Genetics

    Hi, I really need help in how to approach this question: A species of tiny antelope, known as the zephyr, has an XY system of sex determination, similar to mammals. Zephyr males have small antlers and females do not. The antlers can be two pronged (2-pr)

    asked on February 6, 2011
  51. math Algebra I

    Perimeter of table top is 28 feet. The difference between 4 times the length and 3 times the wide is 21 feet. Find the dimension. (Use system of linear equations to solve.)

    asked on May 13, 2011
  52. accounting

    The monetary contributions that the owners of IBM pay for shares of the company's stock are ____ resources for IBM. a. material b. financial c. human d. informational e. manufacturing Patents and copyrights confer value on a firm but do not exist

    asked on October 29, 2012
  53. Chemistry

    Consider the voltaic cell illustrated in the figure, which is based on the cell reaction: Zn(s)+Cu^2+(aq) -> Zn^2+(aq)+Cu(s) Under standard conditions, what is the maximum electrical work, in joules, that the cell can accomplish if 52.0g of copper is

    asked on April 16, 2012
  54. Chemistry

    Copper(II) chloride and lead(II) nitrate react in aqueous solutions by double replacement. Write the balanced chemical equation, the over all ionic equation, and the net ionic equation for this reaction. If 16.06g of copper(II) chloride react, what is the

    asked on March 16, 2010
  55. Physics

    A 50 kg satellite circles the earth in an orbit with a period of 110 min. What minimum energy E is required to change the orbit to one with a period of 320 min? Assume both the initial and final orbits are circular. The Earth’s radius is 6.37 × 10^6 m,

    asked on January 30, 2015
  56. Math

    A calendar that has one page per day is 7 inches long, 7 inches wide, and 2 inches high. What is the volume of one page of the calendar? Round your answer to the nearest thousandth.

    asked on April 28, 2014
  57. chemistry

    Copper(II) sulfide reacts with oxygen to produce copper (II) oxide plus sulfur dioxide. Suppose you start this reaction with 50.0 grams of copper(II) sulfide and 50.0 grams of oxygen and you actually produce 33.5 grams of copper(II) oxide. Calculate the

    asked on March 5, 2014
  58. Math

    George studied 1/4 hour on Monday and 3/8 hour on Tuesday. How long did he study altogether on both days?

    asked on June 18, 2013
  59. Statistics-Probability

    An instructor will choose 3 problems from a set of 7 containing 3 hard and 4 easy problems. If the selection is made at random, what is the probability that only the hard problems are chosen?

    asked on February 5, 2013
  60. calculus

    A metal chain weighs 30 lbs and is 10 feet long. How much work is required to lift one end of the chain to a height of 15 feet (so that the other end of the chain will be at a height of 5 feet)?

    asked on December 1, 2011
  61. chemistry

    A laboratory instructor gives you a test tube containing Ag+ ,Ba 2+ , and Cu 2+ ions. Devise a reaction scheme that would allow you to selectively precipitate each of these ions. Write a balanced net ionic equation for each precipitation reaction.

    asked on March 17, 2014
  62. algebra

    Adult tickets for a play cost $16 and child tickets cost $6. If there were 25 people at a performance and the theater collected $260 from ticket sales, how many adults and how many children attended the play?

    asked on June 20, 2012
  63. Chemistry

    Complete and balance the following equation: NO2{-} + Cr2O7{2-} = Cr{3+} + NO3{-}

    asked on April 16, 2012
  64. Math

    Jan is a 35-year-old individual who plans to retire at age 65. Between now and then $4000 is paid annually into her IRA account, which is anticipated to pay 5% compounded annually. How much will be in the account upon Jan’s retirement?

    asked on March 6, 2016
  65. Math

    5x/3+y=c 2y=c-4x x+y=6 What is c? I've tried substituting y as x-6 however I'm still not getting it.

    asked on August 29, 2015
  66. Physics

    A camera falls from a blimp that is 399 m above the ground and rising at a speed of 9.75 m/s. Find the maximum height reached by the camera with respect to the ground. The acceleration of gravity is 9.8 m/s^2.Answer in units of m. b)Find the speed at which

    asked on October 10, 2014
  67. math

    write and solve an equation to find the missing dimension of the rectangular prism. Volume= 1km cubic L=3/4 km W=2/3 km H= ?

    asked on April 28, 2014
  68. math

    3. (TCO A) The following questions are worth 5 points each. Please show all work. a. Inflation is expected to average five percent for the long term and Mr. Smith earned $74,000 this year, how much must he earn in 20 years just to keep up with inflation

    asked on August 5, 2012
  69. english

    What nursery rhyme character was a "wise galoshes wearing feline" answer has 12 letters.

    asked on January 20, 2010
  70. Statistics

    A hospital claims that the mean waiting time at its emergency room is 25 minutes. A random sample of 16 patients produced a mean wait time of 27.5 minutes with a standard deviation of 4.8 minutes. Use the 1% level of significance to test is the wait time

    asked on March 28, 2013
  71. Chemistry

    What acid and what strong base would react in aqueous solution to produce the following salts in the formula equation? Write the balanced formula equation for each reaction. a) potassium perchlorate b) cesium nitrate c) calcium iodide I don't need just the

    asked on December 28, 2011
  72. college chemistry

    How do I name the following compounds; K2S2O8, S2O8{-2}, Na2S2O3 and S2O3{-2}

    asked on February 25, 2009
  73. Geometry

    What is the perimeter of rectangle WXYZ, with vertices W(-3,7), X(-5,4), Y(1,0), and Z(3,3) to the nearest unit. PLEASE HELP. A. 36 UNITS B. 30 UNITS C. 22 UNITS D. 11 UNITS

    asked on September 15, 2015
  74. math

    A cube with side length 4 centimeters is 25% full of sand.What is the volume of the sand?

    asked on April 28, 2014
  75. chemistry

    You need to determine the concentration of a sulfuric acid solution by titration with a standard sodium hydroxide solution. You have a 0.1896 M standard solution. You take a 25.00 mL sample of the original acid solution and dilute it to 250.0 mL. You then

    asked on April 11, 2014
  76. Phyisics

    1. Two concentric conducting spherical shells have radii of 0.126 m. and 0.225 m. The inner sphere bears a charge of -8.00E-08 C. An electron escapes from the inner sphere with negligible speed. Assuming that the region between the spheres is a vacuum,

    asked on March 18, 2015
  77. algebra

    Which of the following points lies on the circle whose center is at the origin and whose radius is 10 (-6,4) (/10,/10) (6,-8)

    asked on November 21, 2014
  78. physics

    A bungee jumper jumps from a bridge with a 3 m long bungee cord. Once the cord starts to stretch, it acts like an ideal spring with coefficient of elasticity k=100 N/m. What should be the minimum height of the bridge in m so that this jump is safe for the

    asked on July 23, 2013
  79. math calculus

    The marginal cost of a product is modeled by dC/dx= 16/cube root 16x + 3 where x is the number of units. When x = 17, C = 120. (a) Find the cost function. (Round your constant term to two decimal places.) c= (b) Find the cost of producing 90 units. (Round

    asked on May 28, 2013
  80. calculus 2

    what is the polar area between r=5sinx and r=5cosx

    asked on December 7, 2011
  81. physics

    A 55 kg student traveling in a car with a constant velocity has a kinetic energy of 1.6 104 J. What is the speedometer reading of the car in km/h?

    asked on September 17, 2010
  82. chemistry

    identify the atoms that are being oxidized and reduced.. 2FeCl3 + 2KI --> 2FeCl2 + 2KCl + I2

    asked on March 29, 2010
  83. statistics

    slot machines are now video games, with outcomes determined by random number generations. in the old days, slot machines were like this: you pull the lever to spin 3 wheels; each wheel has 20 symbols, all equally likely to show when the wheel stops

    asked on March 23, 2010
  84. stats

    you have torn a tendon and are facing surgery to repair it. the surgeon explains the risk to you: infection occurs 3% of such operations, the repair fails in 14%, and both infection and failure occur together in 1%. what percent of these operations succeed

    asked on March 23, 2010
  85. Physics AP C

    Two trains, each having a speed of 22 km/h, are headed at each other on the same straight track. A bird that can fly 60 km/h flies off the front of one train when they are 70 km apart and heads directly for the other train. On reaching the other train it

    asked on August 26, 2009
  86. Science

    Which of the following questions is outside the scope of science? a. how are religion and philosophy different b.what is the diet of an american alligator c. how do humans digest protein d. how does gravity affect an airplane's motion

    asked on September 1, 2016
  87. math

    Lexi and Maria had $250 altogether. After Lexi spent25of her money and Maria spent $40, they had the same amount of money left. How much money did Lexi have in the beginning?

    asked on March 12, 2015
  88. Physics

    A 7300-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the

    asked on October 3, 2014
  89. Mergers and Acquisitions

    How does goodwill (under FASB 141 R) impact cash flows of the combined entity? How do the 1993 tax law changes impact goodwill and the after tax cash flows of the combined entity after the M & A?

    asked on June 17, 2012
  90. Economics

    The market demand in a Bertrand duopoly is P = 15 - 4Q, and the marginal costs are $3. Fixed costs are zero for both firms. Which of the following statement(s) is/are true? a.P = $3. b.P = $10. c.P = $15. d.None of the statements associated with this

    asked on March 20, 2012
  91. Physics

    The two cubes in the drawing are made from the same material. The radiant energy per second emitted by the small cube is 3.70 J/s. What is the energy emitted per second by the larger one?

    asked on October 3, 2011
  92. MO theory regarding heteronuclear diatomic molecul

    Hi all I am having trouble finding the MO order for heteronuclear diatomic molecules: In my textbook, heteronuclear order is listed as: 1o 2o 3o 4o 1pi 5o 2pi 6o where o = sigma When I first saw it, I was confused; how can the above be correct? If one were

    asked on November 11, 2009
  93. Physics

    A boy weighing 40kg runs at 8.0m/s grabs a rope and swings of level ground. What maximum height does the child reach? How do I solve this?? it is under the conservation of energy section of work, power and energy. any help would be great! thanks

    asked on March 26, 2008
  94. Maths

    Mr Sanderson makes some cookies for a festival day. She gave 1/4 of the cookies to her sister and 1/3 of the remainder to a neighbour. If she had 120 cookies left, how many cookies did she make in the beginning? Linda spent 1/4 of her money on books, 1/3

    asked on July 15, 2016
  95. Calculus III

    Evaluate ∭W f(x,y,z)dV for the function f and region W specified: f(x,y,z) = 18(x+y) W: y≤ z≤x ; 0≤y≤x ; 0≤x≤1 ∭W (18(x+y))dV =

    asked on November 24, 2015
  96. algebra

    Perform the indicated operation y/y-5+5/5-y

    asked on November 24, 2014
  97. PHYSICS

    Starting from rest, a 2.0 10-4-kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.36 N on it. This force does +2.5 10-4 J of work on the flea. -How far does the flea move while

    asked on October 3, 2014
  98. PHYSICS

    A golf club strikes a 0.041-kg golf ball in order to launch it from the tee. For simplicity, assume that the average net force applied to the ball acts parallel to the ball's motion, has a magnitude of 6400 N, and is in contact with the ball for a distance

    asked on October 3, 2014
  99. Statistics

    Cola Corporation produces Orange Cola. The filling machines are adjusted to pour 12 ounces of soda into each 12-ounce can. However, the actual amount of soda poured into each can is not exactly 12 ounces; it varies from can to can. It has been observed

    asked on February 19, 2013
  100. Algebra

    A farm stand owner mixes apple juice and cranberry juice. How much should he charge if he mixes 8 L of apple juice selling for .45/L with 10 L of cranberry juice selling for $1.08/L?

    asked on October 8, 2012

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