Questions Asked on
June 13, 2013

  1. Statistics

    In a genetics experiment on peas, one sample of offspring contained 421 green peas and 166 yellow peas. Based on these results, estimate the probability of getting an offspring pea that is green. Is the result reasonably close to the value of 3/4 that was

  2. Calculus

    The demand function for the Luminar desk lamp is given by the following function where x is the quantity demanded in thousands and p is the unit price in dollars. p = f(x) = -0.1x2 - 0.3x + 39 (a) Find f '(x). f '(x) = (b) What is the rate of change of the

  3. Calculus

    A car leaves an intersection traveling west. Its position 5 sec later is 22 ft from the intersection. At the same time, another car leaves the same intersection heading north so that its position 5 sec later is 27 ft from the intersection. If the speed of

  4. math

    The sales of a certain product after an initial release can be found by the equation where s represents the total number of units sold and t represents the time in weeks after release. How many weeks will pass before the product sells about 150 units?

  5. science

    A snail travels 45 cm in 20 min. Its average speed is Answer 2.25 cm/h. 15 cm/h. 90 cm/h. 135 cm/h.

  6. Precal

    An indoor physical fitness room consists of a rectangular region with a semicircle on each end. The perimeter of the room is to be a 200-meter running track. a) Draw a figure that visually represents the problem. Let x and y represent the length and width

  7. math

    10. A house painter can finish a house in 6 hours. His partner can finish the same house in 12 hours. Which of the following is the number of hours it would have taken them to finish painting the house if they had worked together? A. 3 hours B. 4 hours C.

  8. math

    The polar coordinates of a point P are (2,240 degrees). The Cartesian (rectangular) coordinates of P are

  9. Calculus

    Let f be the function defined as follows. $ y = f(x) = {\color{red}5} x^2 -{\color{red}9} x +{\color{red}10} $ (a) Find the differential of f. dy = (b) Use your result from part (a) to find the approximate change in y if x changes from 2 to 1.97. (Round

  10. maths

    A polynomial f(x)satisfies the equation f(x)+(x+1)^3=2f(x+1) Find f (10)

  11. Statistics

    The probability of a randomly selected car crashing during a year in a certain country is .0479. If a family has three cars, find the probability that at least one of them has a car crash during a year.

  12. Physics

    A rocket blasts off. In 10.0 seconds it is at 10,000 ft, traveling at 3600 mph. Assuming the direction is up, calculate the acceleration.

  13. math

    3. One hundred twenty-five tickets have been sold for an event at a local theater. If this represents 25% of the capacity for the theater, which of the following is the capacity? A. 156 B. 375 C. 410 D. 500

  14. Calculus

    Let f(x) = 4x5/4 + 10x3/2 + 9x. Find the following. (a) f '(0) = (b) f '(16) =

  15. Calculus

    The relationship between the amount of money x that Cannon Precision Instruments spends on advertising and the company's total sales S(x) is given by the following function where x is measured in thousands of dollars. S(x) = -0.002x3 + 0.9x2 + 4x + 500 (0

  16. English

    1. To get the place, go out of the school gate. Turn left. Then go straight for 300 meters. It is on your right between City Bank and the bakery. 2. To get the place, go out of the school gate. Turn left. Then go straight for 5 minmutes. It is on your

  17. math

    there are 40 pupils in a class. each girl is given 5 books and each boy is given 4 books.the girls have 65 more books than the boys. how many more girls than boys are there in the class?

  18. math

    find the polynomial whose zeroes are -5 and -4.

  19. Geometry

    In a certain game, a player throws a standard 6-sided number cube twice per turn. What is the probability that the result of the first throw will be a 1, and the result of the second throw will be greater than 3?

  20. Math

    Evaluate the piecewise defined function at the indicated values. f(x) = x^2 if x < 0 x + 9 if x ≥ 0 f(−3) = f(−2) = f(0) = f(2) = f(3) =

  21. math

    Jeremy surveyed students at his school for his math project. When he analyzed the results, 38 students, or 18% of those surveyed, selected hamburgers as their favorite food. How many poeple did Jeremy survey for his math project? (Round your answer to the

  22. math

    Dennis bought a book for $12.95, and his total bill was $13.92. What was the sales tax that was applied to his purchase? What I got was 7.5% but I wanted to make sure it was correct.

  23. French

    Is this sentence correct? Or did I conjugate it wrong? :Je vais au cinéma hier.

  24. Boolean Algebra

    In the country of Genovia, the president wants to ensure that the Monetary Committee can activate a device that opens the country’s safe. The safe system is to be activated by a device that obeys the following rules: Each member of the Monetary Committee

  25. ratio

    The ratio of cats to dogs is 6:4. What percentage of the animals at the shelter are cats.

  26. Calculus

    The total worldwide box-office receipts for a long-running movie are approximated by the following function where T(x) is measured in millions of dollars and x is the number of years since the movie's release. T(x) = (120x^2)/(x^2 + 4) How fast are the

  27. Calculus

    Let f be the function defined as follows. $ y = f(x) = \sqrt{{\color{red}3} x +{\color{red}10}}$ (a) Find the differential of f. dy = (b) Use your result from part (a) to find the approximate change in y if x changes from 4 to 4.1 (Round your answer to

  28. Math check

    Consider a normal population with ì = 49 and ó = 6. Calculate the z-score for an x of 44.2 from a sample of size 22. (Give your answer correct to two decimal places.) 44.2-49/6/22^=.00165=.00

  29. Chemistry

    How would you be able to recognise that C5H8 was an alkyne? And how would you know that CH3COCH3 was a ketone? (I thought it was an ether)

  30. space

    Consider a situation where immediately after birth, twins are separated. One continues to live on earth, while the other is whisked away in a space ship at 90% of the speed of light. After 65 years they are reunited. Will they look the same? Show proof of

  31. Maaaath

    a stone thrown upward from the top of a 320-foot cliff at 128 ft/sec eventually falls to the beach below? how long does the stone take to reach its highest point?

  32. Science

    What is the circular velocity of an Earth satellite 1000. km above Earth's surface? (Note: Earth's average radius is 6371 km.)

  33. physics

    The most convenient way to express vectors in the two dimensional plane is in the familiar (x,y) Cartesian coordinates. However, one can express vectors in other coordinate systems as well. For example, another useful coordinate system for the plane is

  34. math

    a number rounds off to 4000. the digit in the hundreds place is twice the digit in the tens place. the sum of the digits is 12. find the number uses only two different digits. find the number.

  35. science

    how many molecules of oxygen are produced from the balanced equation 2kclo3=2kcl+3o2

  36. math

    a number rounds off to 4000. the digit in the hundreds place is twice the digit in the tens place. the sum of the digits is 12. find the number uses only two different digits. find the number.

  37. Physics

    Two fixed, non-conductive, isolated rings of radii 25 cm are electrified and brought close to each other so that they are parallel. The distance between them is 1 m. You know that one of them has a charge of 1 nC(Nano Coulomb) evenly distributed on it, but

  38. The defects of ball mill

    The Ball Mill faults: (1) work efficiency is low, the power consumption unit. (2) the ball mill barrel rotational speed is low (about 15 ~ 27 r/min), if you use ordinary motor that. The average all need equipped with expensive reducer. (3) grinding medium

  39. Direct way to improve yield of ball mill

    The Ball Mill as a general grinding equipment, is widely used in dressing, building materials and chemical industry, ball mill can be divided into dry and wet type two kinds of grinding way. According to the row of ore in different ways, and can be divided

  40. math

    Consider a 25×25 grid of city streets. Let S be the points of intersection of the streets, and let P be the set of paths from the bottom left corner to the top right corner of which consist of only walking to the right and up. A point s is chosen

  41. physics

    If you watch little kids try to open doors, they will often just push anywhere on the door, rather than on the edge like adults do. This is because they don't understand that it's easier to open a door if you push on the edge. But how much easier? Consider

  42. physics

    The most convenient way to express vectors in the two dimensional plane is in the familiar (x,y) Cartesian coordinates. However, one can express vectors in other coordinate systems as well. For example, another useful coordinate system for the plane is

  43. maths

    A 20 foot ladder is leaning against a building.if the ratio of the base of ladder's distance from the building to its top's height from the ground is 3:4,find how high the top of the ladder is from the ground.

  44. Math

    what is the value of pie?

  45. Calculus

    Find an equation for the tangent line of the function f(x)=6+10xe^x at the point (0,6).

  46. Calculus

    The equation of motion of a particle is s=4t^3−7t, where s is in meters and t is in seconds. Find a) the velocity of the particle as a function of t : v(t)= b) the acceleration of the particle as a function of t : a(t)= c) the velocity after 5 seconds d)

  47. Physics

    A car travels 30 km north in 25 min. and 40 km east in 35 min. What is the total distance traveled?

  48. Physics

    If the odometer on the car reads 25.0 km at the beginning of a trip and 65.0 km a half hour later, what is the average speed of the car? (Remember significant digits.)

  49. Physics

    City B is northwest of City A, and the 400 mile trip by car takes 8 hours. The cities are 320 miles apart if able to travel in a straight line. What is the speed of a trip from City A to City B?

  50. Physics

    When u type on a computer keyboard, do u do work on the computer keys? Pleasee explain

  51. social science

    how is biology related to tourism?

  52. Calculus

    Given that f(x)=x^8h(x) h(−1)=5 hŒ(−1)=8 Calculate fŒ(−1).

  53. Physics

    While traveling south on an expressway, a car traveling 60 mph (miles per hour) slows down to 30 mph in 12 minutes due to traffic conditions. Calculate the acceleration.

  54. Precal

    An indoor physical fitness room consists of a rectangular region with a semicircle on each end. The perimeter of the room is to be a 200-meter running track. a) Draw a figure that visually represents the problem. Let x and y represent the length and width

  55. Physics

    A ball is thrown horizontally at 20 m/s from the top of a cliff 50 meters high. How far from the base of the cliff does the ball strike the ground?

  56. Physics

    An object is dropped from a platform 100 feet high. Ignoring wind resistance, what will its speed be when it reaches the ground?

  57. GEOMETRY BETWEENNESS URGENT !!

    POINTS H, I , AND J ARE THREE POINTS ON A LINE WITH COORDINATES -4/5, -1/SQRT5 AND -1/10. WHICH POINT IS BETWEEN THE OTHER TWO ?

  58. Science

    Rhizopus is a Fugus that causes mouldy bread. Identify the functions of the main features in Rhizopus,when observing it under a microscope.

  59. Science

    Saccharomyces Cerevisiae is a fungi, it is used in the production of bread. Rhizopus is a fungus that causes mouldy bread. What is the difference between the structure of the fungi, when looking at Saccharomyces and Rhizopus under a microscope?

  60. Science

    Calculate the average size of the microbes in Saccharomyces ? show your working out.

  61. Science

    what are the four steps need to ascertain whether a fungus was the causes of the disease.

  62. Physics

    What is the smallest radius of an unbanked (flat) track around which a motorcyclist can travel if her speed is 25 km/h and the coefficient of static friction between the tires and road is 0.28?

  63. organic chem

    If carbon =62.07%,hydrogen=10.34%, and oxygen=27.59%. Determine its empirical formula, name each of them. Do not consider ones > 6-carbons.

  64. science

    The most convenient way to express vectors in the two dimensional plane is in the familiar (x,y) Cartesian coordinates. However, one can express vectors in other coordinate systems as well. For example, another useful coordinate system for the plane is

  65. science

    Does the study by Frenda et al. (2013) prove that our memories are easily manipulated and should therefore not be trusted? Article: False Memories of Fabricated Politicians

  66. Math

    Evaluate the piecewise defined function at the indicated values. f(x) = x2 + 6x if x ≤ −1 x if −1 < x ≤ 1 −1 if x > 1 f(−2) = f(-3/2) = f(−1) = f(0) = f(35) =

  67. mah

    Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = 6x + 7 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h

  68. math

    Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = x^2+7 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h

  69. Math

    Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = 17 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h

  70. MAth

    Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = 2/x+5 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h

  71. math

    Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = x/x+6 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h

  72. math

    Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = 2x/x-7 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h

  73. Math

    Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = 4 − 6x + 7x2 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h

  74. Math

    Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = 7x^3 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h

  75. physics

    give as many characteristics as you can of a bicycle pump

  76. physics

    give as many characteristics as you can of a bicycle pump

  77. physics

    give as many characteristics as you can of a bicycle pump

  78. Computer Science

    write a program that will prompt the user for a value and print the value entered to the screen. The program stops when the user enters a value less than zero. I need an IPO chart, pseudocode and C++

  79. physics

    give as many characteristics as you can of a bicycle pump

  80. math

    20. A tire company manufactures 50 tires an hour with its current staff. The company can make 10 extra tires per hour for every extra worker it hires. Which of the following equations represents this relationship mathematically, with x being the number of

  81. math

    Inches 9 8 - 7 - 6 - 5 - ,--- 4 - t-- ,--- 3 - t-- ,--- ~ t-- 2 1 - - J F M A M J J A s 0 N D Months The graph above represents the amount of rainfall in a particular state by month. Which of the following is the total rainfall for the first 3 months of

  82. math

    Write a question to match this answer: 6 boxes of 12

  83. math

    The cost lunch is $29.40, and Maya $33.81 in all. What percent was the tip that Maya left?

  84. math

    Jphn just purchased a plasma t.v. for his living room. He paid $12,00 for a 46-inch television. The regular price of the television was $1,500. What percentage did John save during the sale? I got 20% but I wanted to see if I was right or not.

  85. maths

    in a class there are 50 students,15 girls wear glasses 8 do not wear glasses.20 boys don't wear glasses.how many students wore glasses

  86. bio

    You want to design a breathing machine that will bring 500 mL of air into the lungs. You begin with 100 mL of air at 2 atm of pressure. How would you change the pressure in your machine to accomplish your goal?

  87. College Physics

    A 57.0 cheerleader uses an oil-filled hydraulic lift to hold four 110 football players at a height of 1.40 . If her piston is 19.0 in diameter, what is the diameter of the football players' piston? The density of the oil in the hydraulic system is 900

  88. ratio

    the ratio of boys to girls at Shadetree Park is 1:3. draw a picture of the children in the park if there are 3 boys. How many boys and girls do I draw?

  89. math

    A rectangle has a perimeter of 24 units. If the width is 4 units, which of the following is the length? A. 6 units B. 8 units C. 10 units D. 16 units

  90. reading

    43. Student Council Election Day: Monday To: Nominees From: Your Principal Concerning: Rules of Election 1. Everyone running for office must prepare a 3-minute speech that will be recorded for presentation to the entire school. You need to "Dress for

  91. reading

    46. Choosing the Resolution for Your Photos Resolution Purpose L (Large) Print larger than A4 size prints 2592 x 1944 pixels (8 .3 x 11 .7 in.) Print larger than letter size prints (8 .5 x 11 in.) M1 (Medium 1) Print up to A4 size prints 2048 x 1536 pixels

  92. Math help

    The International Bottled Water Association says that Americans on the average drink 4.6 (8-oz.) servings of water a day. Assume that the number of 8-oz. servings of water is approximately normally distributed with a standard deviation of 1.4 servings.

  93. reading

    30-day Money Back Guarantee Our Groom Co. electric shavers come with a 30-day money back guarantee because we are focused on ensuring your satisfaction. The only stipulation is that you use your new shaver exclusively for 2 weeks to become accustomed with

  94. Calculus

    Find the slope and the equation of the tangent line to the graph of the function f at the specified point. f(x) = -8/5 x^2 + 7 x + 7;(-1, -8/5) slope tangent line y =

  95. Calculus

    Find the points on the graph of f where the tangent line is horizontal. f(x) = x3 - 15x2 (x, y) = ( , ) (smaller x-value) (x, y) = ( , ) (larger x-value)

  96. Calculus

    Suppose f and g are functions that are differentiable at x = 1 and that f(1) = 2, f '(1) = -1, g(1) = -2, and g '(1) = 3. Find the value of h '(1). h(x) = (x2 + 11) g(x) h '(1) =

  97. Science

    Calculate the linear momentum of a pickup truck that has a mass of 1100 kg and is traveling eastward at 22 m/s.

  98. English

    1. The dog is black and white. 2. There are two black and white dogs in the kennel. 3. There are two black-and- white dogs in the kennel. (Are they all grammatical?) 4. The food is a littel too spicy but delicious. 5. The food is a little spicy and

  99. science

    what could not be part of a tree canopy? a. moss b. roots c. leaves d. branches

  100. Calculus

    The volume of a spherical cancerous tumor is given by the following equation. V(r) = (4/3)pi r^3 If the radius of a tumor is estimated at 1.4 cm, with a maximum error in measurement of 0.003 cm, determine the error that might occur when the volume of the

  101. Math check

    A population has a standard deviation ó of 28 units. (Give your answers correct to two decimal places.) (a) Find the standard error for the mean if n = 10. SD/Sqrt of N = 28/10^=.28

  102. Math (Algebra)

    if i have 3 algebra tiles(big size)and 2 regular size negative tiles what would the expression be?

  103. geometry

    If RS=ST=19, s

  104. Math help

    A sample of 30 of 178 funded projects revealed that 12 were valued at $17,360 each and 18 were valued at $20,280 each. From the sample data, estimate the total value of the funding for all the projects. (Enter your answers to two decimal places.) $

  105. Math check

    Consider the following. (Give your answers correct to two decimal places.) (a) Determine the value of the confidence coefficient z(á/2) for 1 - á = 0.87. =.44 my answer . (b) Determine the value of the confidence coefficient z(á/2) for 1 - á = 0.91.

  106. Calculus

    Follow the steps below for the given function. (Do not use mixed numbers in your answers.) 2x + 5y = 1 Solve the equation for y. y = Differentiate this equation with respect to x. y ' = Complete the steps below to implicitly take the derivative of the

  107. Physics

    Light of intensity 2 Wm^–2 is traveling through air (n = 1.0) is normally incident on a dielectric surface. If the intensity of the reflected light is 0.3 W m^–2 what is the refractive index of the dielectric material?

  108. Calculus

    Find an equation of the tangent line to the graph of the function f defined by the following equation at the indicated point. (x - y - 1)3 = x; (1, -1) y =

  109. Science

    Compared with the strength of Earth's gravity at its surface, how much weaker is gravity at a distance of 10 Earth radii from Earth's center? At 20 Earth radii?

  110. Science

    The Asteroid433Eros has a mass of 7.2 x 1015 kg, and a radius of = 11 km. What is the escape velocity of this asteroid (remember to use r in meters)? What consequence would this have for someone trying to walk on this asteroid?

  111. English30

    According to gallien, why do people come to Alaska? Novel into the wild plz help

  112. physics

    The most convenient way to express vectors in the two dimensional plane is in the familiar (x,y) Cartesian coordinates. However, one can express vectors in other coordinate systems as well. For example, another useful coordinate system for the plane is

  113. physics

    If you watch little kids try to open doors, they will often just push anywhere on the door, rather than on the edge like adults do. This is because they don't understand that it's easier to open a door if you push on the edge. But how much easier? Consider

  114. math

    Consider a 25×25 grid of city streets. Let S be the points of intersection of the streets, and let P be the set of paths from the bottom left corner to the top right corner of which consist of only walking to the right and up. A point s is chosen

  115. math

    A fair coin is flipped 3 times. The probability of getting exactly two heads, given that at least one flip results in a head, can be written as a/b, where a and b are coprime positive integers. What is the value of a+b?

  116. physics

    What is the net force on a cart that is pulled to the right with 120 pounds and to the left with 30 pounds?

  117. physical science

    David builds a wood raft that weighs 100lbs (445 N). The bottom area of the raft is 4 meters and by 3 meters and the raft is 0.6 meters thick. When the raft is floats in water, what must the height of the water line be on the raft?

  118. math check

    Suppose that you are in a class of 31 students and it is assumed that approximately 13% of the population is left-handed. (Give your answers correct to three decimal places.) (a) Compute the probability that exactly five students are left-handed.

  119. Math Help

    Consider the approximately normal population of heights of male college students with mean ì = 69 inches and standard deviation of ó = 4.6 inches. A random sample of 25 heights is obtained. (c) Find the standard error of this sampling distribution. (Give