Most popular questions and responses by Devin
  1. Conditional Probability

    A certain virus infects one in every 400 people. A test used to detect the virus in a person is positive 90% of the time if the person has the virus and 10% of the time if the person does not have the virus. Let A be the event "the person is infected" and

    asked on December 15, 2016
  2. Calculus

    In a 21 meter race between a turtle and a hare, the turtle leaves 8 minutes before the hare. The hare, by running at an average speed of 0.5 meters per hour faster than the turtle, crosses the finish line 4 minutes before the turtle. What are the average

    asked on November 14, 2017
  3. pre-cal

    to find the distance AB across a river, a distance BC= 309m is laid off on one side of the river. It is found that B= 105.4 degrees and C= 12.2 degrees. Find AB To find the distance AB across a river, a distance BC= 309m is laid off on one side of the

    asked on June 5, 2007
  4. ELA

    What effect does Father’s return have on the Sakane family? A Yuki finds it hard to adjust to having both parents tell her what to do B Yuki’s mother continues to worry about the safety of her family C Ken is relieved that his father will take over as

    asked on December 5, 2015
  5. chemistry

    A gas has a volume of 50.0 cm3 at a temperature of -73°C. What volume would the gas occupy at a temperature of -123°C if the pressure stays constant?

    asked on April 23, 2012
  6. math

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

    asked on March 25, 2015
  7. AP Chemistry

    What is the structure for PCl3Br2 and 3 isomers?

    asked on November 19, 2010
  8. College Algebra

    The logistic growth function f(t)= 100,000/5000e^-t describes the number of people, f(t), who have become ill with influenza t weeks after its initial outbreak in a particular community. A) How many people became ill with the flu after the epidemic began?

    asked on April 5, 2016
  9. social studies

    Describe the governments in Mexico and Central America. i think mexico form of government is a democratic form of government, can somebody please just tell me what form of government central america has. ms.sue can you help me

    asked on November 16, 2018
  10. Science

    A horticulturist wants a plant that produces flowers with a certain size, color and fragrance but is not aware of any one plant having all of these traits. The quickest way she could achieve her goal would be to apply the process of

    asked on February 22, 2019
  11. physics

    A 70 kg painter is painting the wall of a building. He stands on a horizontal board of length 4.7 m and mass 15 kg, suspended from vertical ropes attached to each end. If the painter stands 2.0 m from one end of the board, what would the tensions in the

    asked on December 11, 2010
  12. Math

    A football is kicked into the air. Its height in meters after t seconds is given by h(t)=-4.9 (t-2.4)^2+29. A. What was the height of the football when it was kicked? B. What is the maximum height of the kick? C. How long did it take for the football to

    asked on September 28, 2016
  13. chemistry

    h2SO4(aq)+2NAOH(aq)--->NA2SO4(aq)+2H2O(L) how to solve this

    asked on May 31, 2010
  14. math

    Which algebraic expression represents “the difference of 54 and a number”?

    asked on September 8, 2015
  15. physics

    If a 0.1 kg mass is suspended at rest from a spring near the Earth's surface, the distance that the spring is stretched is measured to be 1.0 cm. What is the spring constant of the spring (remember the MKS units)? A mass of 2 kg is attached to a spring

    asked on November 8, 2010
  16. College Chemistry

    1 L of N_2_ gas, having a pressure of 2.5 atm, is added 1 L of Ar gas, having a pressure of 3.7 atm, in a sealed, rigid flask. What is the final pressure in the flask?

    asked on May 8, 2014
  17. Math

    A state lottery requires you to choose 4 cards from an ordinary deck: I heart, 1 club, 1 diamond, and 1 spade in that order from the 13 cards in each suit. If all four choices are selected by the lottery, yo win $5,000. It costs $1 to play. Find the

    asked on April 2, 2013
  18. College Physics

    A person jumps from a window 34 meters high and is caught in a firefighter's net which stretches 0.6 meter. To the nearest m/s^2, what is the magnitude of the person's acceleration in the net?

    asked on August 26, 2012
  19. physics

    43. A block of mass 2.00 kg rests on a ramp tilted at 25.0°. Coefficients of friction for the block/ramp: μs = 0.300, μk = 0.100. A string passing over a high quality pulley connects the block with a bucket as shown below. The bucket contains sand but a

    asked on February 17, 2015
  20. math

    why did the indian wear feathers in his hair

    asked on March 2, 2010
  21. Physics

    A bullet with a mass m=12.5 g and speed v=85.4 m/s is fired into a wooden block with M=113 g which is initially at rest on a horizontal surface. The bullet is embedded into the block. The block-bullet combination slides across the surface for a distance d

    asked on October 25, 2012
  22. Chemistry

    What is the percentage yield for a reaction if you predict the formation of 21 grams of C6H12 and actually recomvered only 3.8 grams? is the answer 18% 3.8g/21g x 100% pls verify.

    asked on October 17, 2010
  23. math

    9x-11 3x+43 ____________ L M N the value of x is

    asked on August 15, 2018
  24. Physics

    (a) How high a hill can a car coast up (engine disengaged) if friction is negligible and its initial speed is 96.0 km/h? (b) If, in actuality, a 750 kg car with an initial speed of 96.0 km/h is observed to coast up a hill to a height 18.0 m above its

    asked on October 17, 2014
  25. Chemistry

    When a chemist burns ammonia according to the reaction below she finds that the reaction releases heat. (It is exothermic.) 4NH3(g) + 3O2(g) 2N2(g) + 6H2O(g) The enthalpy of the reaction DH = -1267 kJ. What is the enthalpy change (in kJ) when 7 grams of

    asked on January 12, 2015
  26. Physics 1 College Level

    If D = 3204 meters and d = 1247 meters in the figure, what is the magnitude of the force on the space ship to the nearest MN? Consider all three to be point masses. I'm not even sure to begin with this question. Any help will be much appreciated!

    asked on June 1, 2013
  27. Physics 1 College Level

    A planet/moon has a mass of 77.89 × 1023 kg and a radius of 7.9 × 106 meters. What is g on the surface to the nearest hundredth of a m/s2? Once again, not really sure where to go with this. Out of the 10 problems I've only had trouble with this and one

    asked on June 1, 2013
  28. physics

    A pendulum has a length of 1m. What is the period of this pendulum? What is the frequency of this pendulum? You measure the period of a pendulum and get 25s. What is the length of the pendulum?

    asked on November 8, 2010
  29. Physics

    An Atwood's machine consists of masses m1 and m2, and a pulley of negligible mass and friction. Starting from rest, the speed of the two masses is 3.80 m/s at the end of 3.16 s. At that time, the kinetic energy of the system is 77.0 J and each mass has

    asked on February 24, 2011
  30. Spanish

    What is wrong with the statement? El va de Miami a Buenos Aires. Esta tomando un vuelo nacional.

    asked on September 15, 2009
  31. math

    Kim has fraction 1 over 2 cup of almonds. She uses fraction 1 over 8 cup of almonds to make a batch of pancakes

    asked on July 6, 2015
  32. Math

    When the waiter was asked to slice the 16-inch (in diameter) pizza into exactly 4 slices of equal size, he decided to do so using concentric circles rather than radial slices. Determine the radii of each of the three cuts he had to make.

    asked on February 14, 2011
  33. Science

    ranging minerals from the hardest to the softest. Chalk, fingernail. steel screw and paper clip

    asked on February 12, 2015
  34. Math

    a.) Given that f(3)=5 and f'(x)=x/((x^3)+3), find the linear approximation of f(x) at x=3. b.)If the linear approximation is used to estimate the value of f(2.9), will it be an overestimation or underestimation? Show justification.

    asked on March 16, 2012
  35. Chemistry

    How many milliliters of pure acetic acid (density = 1.05 g/mL) would be required to prepare 1.00 L of the solution?

    asked on November 16, 2010
  36. Math

    Bank A pays 4.79% compounded monthly, while Bank B pays 4.8% compounded quarterly. Which bank pays more?

    asked on March 5, 2016
  37. College Level Physics

    A horse pulls a cart with a force of 145 newtons at an angle of 30 degrees above the horizontal and moves along at a speed of 2.5 m/s. How much work to the nearest kJ does the force do in 6 minutes?

    asked on June 9, 2013
  38. child development AED 202

    develop a presentation for early childhood and middle childhood groups that addresses health issues appropriate for each developmental level

    asked on June 26, 2010
  39. Algebra

    Jessie needs to rent a truck for two days to move her belongings to college. She can rent a U- Haul for $35 a day plus 25 cents per mile or she can rent a Budget Rental Truck for $25 per day plus 32 cents per mile. Write an equation and solve to find out

    asked on September 16, 2017
  40. chemistry

    A 7.56-g sample of gas is in a balloon that has a volume of 10.5 L. Under an external pressure of 1.05 atm, the balloon expands to a volume of 15.00 L. Then the gas is heated from 0.00 degree C to 25 C. If the specific heat of the gas is 0.909 J/g*C, what

    asked on July 13, 2013
  41. Calculus

    Graph the following function. Find and state the domain, intercepts, asymptotes, intervals of increase and decrease, local extrema, concavity, and inflections points. F(x)=(x+1)/(square root(x^2+1)) I got so far... Domain: (-infinity, infinity) Intercepts:

    asked on October 20, 2012
  42. College Finite

    Assume that the student has a cup with 13 writing implements: 7 pencils, 4 ball point pens, and 2 felt-tip pens. In how many ways can the selection be made if no more than one ball point pen is selected?

    asked on September 6, 2012
  43. Math

    The stopping distance d of a car in feet is related to the speed in mph by the equation d(s)=.02s^2+1.1s Calculate the speed when your stopping distance is: 1.) 51ft 2.) 315.12ft

    asked on February 25, 2012
  44. english

    Crossword puzzle Substitute lively__________ for boring, "tired" words. Has 7 letters

    asked on August 9, 2011
  45. physics

    estimate the rotational kinetic energy of earth, assuming it to be a solid sphere of uniform density

    asked on November 28, 2009
  46. statistics

    To find out what people think, the Gallup Poll selected a random sample of 520 women and 506 men. The pollsters showed them a list of personal attributes and asked them to indicate whether each attribute was “generally more true of men or of women”.

    asked on June 27, 2014
  47. math

    Please show me the steps to solve this problem: The total shipping weight of two crates is 358 pounds. One crate weighs 124 pounds more than the other. What does eah crate weigh?

    asked on October 12, 2011
  48. math

    one side of a right triangle has 2cm less than the hypothuse, and 7cm more than the third side what is the lenghnt of each side

    asked on March 12, 2010
  49. Physical Sciance

    Calculate the density for a rectangular block using the following measurements, Length: 2.70cm, Width:1.10cm, Height: 9.09cm, Mass: 72.17g. Round your answer for density to 2 decimal places. Include the correct unit for density.

    asked on February 26, 2008
  50. Economics

    In a regression analysis, suppose there is, in fact, no seasonal pattern to sales, and the trend line is estimated using dummy variables to account for seasonality. What effect would this have on the estimation? My guess is that it wouldn't affect the

    asked on January 29, 2008
  51. math

    If Mark invests $8000 at 6% simple interest rate, how much money must he invest at an 8% simple interest rate in order for the interest on each investment to be $500. Assume that the amount of time for both investments is the same.

    asked on January 23, 2013
  52. Math Antics

    A certain disease has an incidence rate of 0.5%. If the false negative rate is 7% and the false positive rate is 2%, compute the probability that a person who tests positive actually has the disease.

    asked on December 14, 2016
  53. math

    You get one spin.what is the probability of spinning a number larger than 6 out of 8.

    asked on August 19, 2015
  54. Chemistry

    A 0.885 M solution of sulfuric acid (H2SO4) is to be reacted with a 0.552 M solution of sodium hydroxide to make sodium sulfate and water. How many L of the H2SO4 solution will react with 0.842 L of the NaOH solution? Give your answer to 3 decimal places.

    asked on April 29, 2015
  55. Chemistry

    Calculate the total heat (in Joules) needed to convert 1.602 x 101 grams of ice at -1.383oC to liquid water at 8.554 x 101oC. Melting point at 1 atm 0.0oC Cwater(s) = 2.09 J/goC Cwater(l) = 4.18 J/goC delta Hofus = 6.02 kJ/mol

    asked on January 12, 2015
  56. Complex Physics Problem

    A ladder can fall for two reasons. If it is set too steep and climber gets their mass to the left of the ladder's base, the ladder likely will fall over backwards. If the ladder is set at too shallow of an angle the required force of friction between the

    asked on June 29, 2013
  57. college algebra

    an executive invests $29,000 some at 7% and some at 6% annual interest. if he receives an annual return of $1870, how much is invested at each rate?

    asked on August 26, 2012
  58. Calculus

    a.) Given that f(3)=5 and f'(x)=x/((x^3)+3), find the linear approximation of f(x) at x=3. b.)If the linear approximation is used to estimate the value of f(2.9), will it be an overestimation or underestimation? Show justification

    asked on March 16, 2012
  59. chemistry

    The average out door concentration of carbon monoxide ,co at 15 c and 1 atm of pressure is about 900 micrograms per cm^3 . What is this concentration expressed : on ppm scale ? And on the molecules /cm^3scale?

    asked on December 5, 2011
  60. Algebra1


    asked on December 5, 2011
  61. Engineering

    A 2kg piece of gold metal at 90 C is placed in 5 liters (=5kg) of water at 30 C. Determine the final temperature (Tf).

    asked on November 16, 2011
  62. math

    Tell whether x and y are in a proportional relationship. If so, find the unit rate. Let y be the temperature x hours after midnight. The temperature is 60∘F at midnight and decreases 2∘F every 12 hour.

    asked on October 10, 2018
  63. math

    Find the perimeter of the given triangle. Round your answer to the nearest tenth if necessary. ∆ADF, if ∆ADF ∼ ∆BCE, given BC = 17, BE = 9, CE = 12, and DF = 15. ∆BCE is inside of ∆ADF

    asked on December 9, 2017
  64. Gaussian Elimination Method

    Write the system of equations as an augmented matrix. Then solve for x and y. -3x-y=11 -9x-2y=34 Solution =

    asked on December 15, 2016
  65. Homework

    A poll was taken of 10,439 working adults aged 40-70 to determine their level of education. The participants were classified by sex and by level of education. The results are shown below. Education Level Male Female Total High School or Less 2023 3264 5287

    asked on December 15, 2016
  66. Physics

    A baseball is hit at ground level. The ball reaches its maximum height above ground level 3.2 s after being hit. Then 2.7 s after reaching its maximum height, the ball barely clears a fence that is 81.0 m from where it was hit. Assume the ground is level.

    asked on October 9, 2012
  67. Physics

    A baseball is hit at ground level. The ball reaches its maximum height above ground level 3.2 s after being hit. Then 2.7 s after reaching its maximum height, the ball barely clears a fence that is 81.0 m from where it was hit. Assume the ground is level.

    asked on October 9, 2012
  68. practical english

    Which of the following sentences contains an italicized word that's used as a predicate adjective? A. Jerry looks ILL today. B. Jerry looks INTO the microscope. C. Jerry looks disdainfully at the pile of laundry D. Jerry looks at the map. Is it c?

    asked on September 25, 2012
  69. Math

    A math teacher wrote x^2+bx+c=0 on the board and asked students to find the two real roots. Alice miscopied one of the coefficients and found that 1 and 4 were the roots. Andy miscopied a different coefficient and found that -2 and 3 were the roots.

    asked on February 25, 2012
  70. chemistry

    If the radiicativr decay of nuclear explosion contains 90 Sr , with a half life of 28.1 years how long will it take for 99 of this radioaioot to decay

    asked on December 5, 2011
  71. english

    Crossword puzzle Try to have_________ in length and form of your sentences. 7 letters

    asked on August 9, 2011
  72. College Algebra

    Charlie can grade exams in 2 hours. It takes Mark 6 hours to grade the same exams. If they work together, how long will it take for them to grade the exams?

    asked on March 30, 2011
  73. physics

    A 6.15 kg block slides 1.49 m down a frictionless incline that makes an angle of 60.0° with the horizontal. What is the total work done on the block

    asked on February 17, 2011
  74. algebra

    how would solve this math question 5/8x - 6 3/8x = 1 1/2

    asked on April 14, 2010
  75. algebra

    2. As you are leaving the community, you notice another new community just down the street. Because you are in the area, you decide to inquire about it. a. The sales representative here tells you they also have two floor plans available, but they only have

    asked on March 31, 2010
  76. algebra

    1. Imagine you are in the market for a new home and are interested in a new housing community under construction in a different city. a. The sales representative informs you that there are 56 houses for sale with two floor plans still available. Use x to

    asked on March 31, 2010
  77. math

    Short projectile motion question A German rocket from the second world war had a range of 3000meters reaching a maximum height of 1000meters. Determine the rockets maximum velocity

    asked on March 12, 2010
  78. math

    for math test ncca/ equations and inequal

    asked on February 26, 2018
  79. Economics

    what is a hype song to rap to a economics question. Like this example: search (I'm on econ) on youtube

    asked on April 21, 2015
  80. Dynamics

    The acceleration of a particle moving along a straight line is inversely proportional to its speed with the constant of porpotionality being k. The body starts from the position s = x0 ^i with initial speed v0. Determine the velocity of the particle as a

    asked on January 22, 2013
  81. Physics

    A train at a constant 44.0 km/h moves east for 42 min, then in a direction 45.0° east of due north for 17.0 min, and then west for 51.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of

    asked on October 9, 2012
  82. Physics

    A batter hits a pitched ball when the center of the ball is 1.35 m above the ground.The ball leaves the bat at an angle of 45° with the ground. With that launch, the ball should have a horizontal range (returning to the launch level) of 106 m. (a) Does

    asked on October 9, 2012
  83. Physics

    A baseball is hit at ground level. The ball reaches its maximum height above ground level 3.2 s after being hit. Then 2.7 s after reaching its maximum height, the ball barely clears a fence that is 81.0 m from where it was hit. Assume the ground is level.

    asked on October 9, 2012
  84. science

    need a example of the ecosystem cliche

    asked on January 11, 2012
  85. chemistry

    Lewis dot of free radical cf2cl and hoco

    asked on December 5, 2011
  86. chemistry

    How many grams of na cl are required to make 500ml of a 0.65 percent w/v

    asked on December 5, 2011
  87. algebra

    The time it takes you to go 12 miles upstream is 5/4 the time it takes you to go 14 miles downstream. If the current is 3mph, how fast do you go in still water.

    asked on February 25, 2012
  88. Math

    The letters A,B,and C represent three different digits. Determine the number ABC if ABC + ACB ---------- BCA

    asked on February 14, 2011
  89. Algebra 1

    9x-8y=42 4x+8y=-16

    asked on February 3, 2009
  90. Abstract Algebra

    Let H={a+bi a,b is a element R, a^2+b^2=1} be a subset of the non zero complex numbers C*. Prove that H

    asked on December 7, 2007
  91. math-ish

    What words does tcnaio make unscrambled? Try these: =) action atonic tonica cation

    asked on May 23, 2007
  92. Algebra 2

    I need help-exam tomorrow! Although it is too late for your exam, in the future, we need specifics to provide help plus time to respond. We are volunteers and are not available 24/7. I hope this helps you in submitting future questions. Thanks for asking.

    asked on May 22, 2007
  93. physics

    1- a pipe of diamter 1cm carreiers water flowing at 1m/s. the end of the pipe is bplugged and there is a small holeon the top as shown which is 1mm diameter. How high does the water go? *=hole ()____________*___() 2. you're indoors, with a door 1m wide and

    asked on December 5, 2006
  94. Chemistry

    66.9 g of a substance X dissolves in enough water to make 0.428 L of a 0.68 M solution. Calculate the molar mass of X in g/mol.

    asked on April 29, 2015
  95. physics

    A plane cruising along at 268 m/s, in straight level flight wants to drops a bomb. He is at a height of 1000m. At what distance should the pilot release the bomb in order to hit his target?

    asked on November 9, 2014
  96. 8th grade math

    At 2pm the temperature is 22 degrees, by 4am it is negative 7 degrees. We think the answer in the change of temperature is 29 degrees am I right?

    asked on September 30, 2014
  97. 8th grade Math

    At 2pm the temperature is 22 degrees, by 4am it is negative 7 degrees. We think the answer in the change of temperature is 22 degrees am I right?

    asked on September 30, 2014
  98. math

    what is the exponential form of 1000 * 1000

    asked on August 25, 2014
  99. math

    How do you solve sqrt(1-(9/x^2))? I know the answer is sqrt x^2 -9/x but I'm not sure how to get the answer on my own. If you could show steps on how to get the answer that would help me a lot!

    asked on February 11, 2014
  100. math

    how do I figure the circumference of race track that takes 3 lap to make a mile?

    asked on December 17, 2013


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