Popular questions and responses by Brad
1. ## algebra

A ball is dropped from a height of 12 feet and returns to a height that is half the height from which it fell. the ball continues to bounce half the height of its previous bounce each time. How far will the ball have traveled vertically when it hits the

2. ## Algebra 1

The function A = A0e-0.01386x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 500 pounds of the material are initially put into the

3. ## algebra

The second term in a geometric sequence is 20. The fourth term in the same sequence is 45/4, or 11.25. What is the common ratio in the sequence? Thanks for reading :)

4. ## algebra

A body was found at 10 a.m in a warehouse where the temperature was 40 degrees Fahrenheit. The medical examiner found the temperature of the body to be 80 degrees Fahrenheit. What is the approximate time of death? Use Newtons law of cooling, with k =

5. ## Probability and Statistics

A package contains 12 resistors, 3 of which are defective. If four are selected, find the probability of getting the following. No defective resistors One defective resistors 3 defective resistors

6. ## Math

Each page of a top-secret report on aliens requires 2 KB of space in digital format. What is the maximum number of pages the report can have so that it can be completely stored on a USB drive that holds 4*10^6 Write your answer in scientific notation, and

7. ## english

Shortly before the Russian Revolution, an eccentric man named Rasputin became ______as the "mad monk." Because he dressed like a peasant, drank heavily, and rarely bathed, the nobility often felt ____during their encounters” with him at the palace. Yet

8. ## History

What effect did the eastern front have on World War I?

9. ## Chemistry

Ba(OH)2(aq)+2CH3COOH(aq)=Ba(CH3COO)2(aq)+2(l)H2O what is the net ionic equation with phases?

10. ## Statistics

Suppose that the travel time from your home to your office is normally distributed with a mean of 40 minutes and standard deviation of 7 minutes. If you want to be 95% certain that you will not be late for an office appointment at 1:00pm, what is the

11. ## physics

Bumpers on cars are not of much use in a collision. To see why, calculate the average force a bumper would have to exert if it brought a 1200 kg car (a so-called "compact" model) to a rest in 15 cm when the car had an initial speed of 2 m/s (about 4.5

12. ## math

A bag contains 44 U.S. quarters and six Canadian quarters. (The coins are identical in size.) If seven quarters are randomly picked from the bag, what is the probability of getting at least one Canadian quarter? (Round your answer to one decimal place.)

13. ## physics

A fire helicopter carries a 664 kg bucket of water at the end of a 24.9 m long cable. Flying back from a fire at a constant speed of 44.2 m/s, the cable makes an angle of 41.6o with respect to the vertical. Determine the force of air resistance on the

14. ## chemistry

A mixture formed by adding 55.0 mL of a 1.5x10^-2 M HCl to 140 mL of 1.0x10^-2 M HI. How do you calculate the pH for this problem?

15. ## Statisics Question Help Please

The proportion of students in private schools is around 11%. A random sample of 450 students from a wide geographic area indicated that 55 attended private schools. Estimate the true proportion of students attending private schools with 95% confidence. How

16. ## Physics

What would the slope represent in a torque vs force graph, and what would its units be. I graphed the points and got a slope of .4778, but am not sure what it represents.

17. ## College Algebra

A total of \$14,000 is invested in 3 accounts earning 3%, 4%, and 5% annual interest. The combined interest for one year is \$539. If the amount invested at 5% is three times the amount at 4%, find the amount invested at 3%.

18. ## math

A population is increasing according to the exponential function defined by y = 2e0.02x, where y is in millions and x is the number of years. How large will the population be in 3 years?

19. ## Physics

The molecular bonds of diatomic molecules can be modeled as springs. The spring constant, k, for a HCl molecule is known to be 480 N/m. If the reduced mass of the molecule is 1.626×10-27 kg, what is the frequency at which the atoms in this molecule

20. ## physics

Initially, a particle is moving at 5.45 m/s at an angle of 38.5° above the horizontal. Four seconds later, its velocity is 6.24 m/s at an angle of 54.3° below the horizontal. What was the particle's average acceleration during these 4.00 seconds in the

21. ## math

a vector has a magnitude of 18.3 cm and a direction of 38 degrees. find the magnitude of its vertical and horizontal components to the nearest tenth.

22. ## Algebra 1

Evaluate the given binomial coefficient ( 8 ) 4

23. ## Algebra 1

Larry has \$2600 to invest and needs \$3000 in 11 years. What annual rate of return will he need to get in order to accomplish his goal, if interest is compounded continuously?

24. ## physics

a 1.5 kg box moves back and forth on a horizontal frictionless surface between two different springs. the box is initially pressed against the stronger spring compressing it 4.0 cm , and then is released from rest,A) by how much will the box compress the

25. ## Algebra

A deep-sea diver must descend and ascend in short steps to equalize pressure on her body. If the diver rises toward the surface too quickly, she may suffer from a physical condition called "the bends." Suppose the diver descends to the bottom in three

26. ## thermo

an open container with 10L of water at 1 bar and 20 C is used for cooling electronic parts.Each electronic part has a mass of 01.kg and an average specific heat of 0.14 kJ/kg-K. The electronic parts are initially at 300 degrees Celcius and are required to

27. ## Math

There are three times as many chickens than pigs on a farm. All the chickens and pigs have 2400 feet all together. How many more chickens than pigsare there?

28. ## Calculus

a ladder 6m long is leaning against a wall. if the top of th ladder is slipping down at th rate of 13 m/s, how fast is the bottom moving away from the wall when it is 5m from the wall? (answer in m/s) Please Help Before 230 pm central time

29. ## algebra

Find the accumulated value of a CD of \$20000 for 3 years at an interest of 3.1% if the money is compounded continously.

30. ## algebra

How long will it take \$1400 to double at 12% annual interest compounded quarterly?

31. ## geometry

What is the volume of a cone with a radius of 3 and a height of 19?

32. ## Chemistry

Calculate the molarity of the HCl from the volumes of acid and base and the molarity of the NaOH. Use the following equation: (molarity of acid)x(volume of acid)=(molarity of base)x(volume of added base) equivalance point=number of mL of base to an acid

33. ## Algebra

Rhode Island is the smallest state in the United States. Its land area is about 2.9 × 1010 square feet. Alaska, the largest state, is about 5.5 × 102 times as large as Rhode Island. What is the land area of Alaska in square feet? Write your answer in

34. ## Chemistry 2

The solubility of CO2 in water is 3.2 x 10^2 M at 25 C and 1 atm pressure. What is the Henry's Law constant for CO2 in mol/(L atm)? c=kP 0.25= kP p=kc p/k=kc/k =Px 1/k Please help!

35. ## Physics

A thin copper plate of diameter 11.0 cm is charged to 9.00 nC. What is the strength of the electric field 0.1 mm above the center of the top surface plate?

36. ## Calculus - Differentials

The diameter of a shpere is measured to be 6 inches with a possible error of 0.05 inches. Use differentials to estimate the maximum error in the calculated surface area. I've gotten this far: A=4pir^2 dA=8(pi)(r)(dr) Since the problem gives me the diameter

37. ## math

The sun hits a building of unknown height so that the building casts a shadow of 517 feet. If the angle of elevation from the tip of the shadow to the sun is 16 degrees, how tall is the building?

Miday Quong is buying bagels for her coworkers. She buys a dozen bagels priced at \$5.49 a dozen. The bakery's cost for making the bagels is \$2.25 per dozen. What is the markup rate based on selling price on a dozen bagels? 17.3 41.0 24.4 59.0

39. ## physics

Position vector r⃗ has magnitude of 15.0 m and direction angle 250 ∘. Find its components. Find the components, magnitude, and direction of the vector −2r⃗ . Where do I start?

40. ## physics

how to determine the net electric force on q3 q3= + 10 uC distance from q3 to q2 =40 cm distance from q1 to q2 =50 cm distance from q1 to q3 = 30 cm q2 =-80 uC q1=+50 uC

41. ## Physics

Two blocks, stacked one on top of the other, slide on a frictionless horizontal surface. The surface between the two blocks is rough, however, with a coefficient of static friction equal to 0.50. The top block has a mass of 2.6 kg, and the bottom block's

42. ## Physics

4.82 kJ work is done by a worker pulling a crate across the deck of a ship at a constant speed of 7.82 m/s by a 453 N force. The rope is being pulled at a 37.0 degree angle to the deck. a)How far was it pulled? b)What is the friction force? c)What is the

43. ## math

You are the accountant for Suite Dreams, a retail furniture store. Recently, an order of sofas and chairs was received from the manufacturer with terms of 3/15, n/45. The order amounted to \$230,000, and Suite Dreams can borrow money at 13% ordinary

44. ## math

A planned community has 300 homes, each with an automatic garage door opener. The door opener has eight switches that a homeowner can set to 0 or 1. For example, a door opener code might be 01100101. Assuming all the homes in the community are sold, what

45. ## math

If a person draws two cards from a standard deck (without replacing them), what is the probability that at least one of the cards is a face card? (Round your answer to one decimal place.)

46. ## chemistry

The vapor pressure of pure water at 70°C is 231 mm Hg. What is the vapor pressure depression of a solution of 115 g of the antifreeze ethylene glycol, C2H6O2, a nonvolatile compound, in 205 g of water? Use molar masses with at least as many significant

47. ## Chemistry

help...If exactly 5.0 mL of HNO3 will neutralize 15 mL of 2.0 M NaOH, what is the molarity of the HNO3 solution? Have no idea what to do. thank you.

48. ## Physics

A dart is thrown horizontally with an initial speed of 11 m/s toward point P, the bull's-eye on a dart board. It hits at point Q on the rim, vertically below P, 0.19 s later. (a) What is the distance PQ? (b) How far away from the dart board is the dart

49. ## Stats

The wildlife department has been feeding a special food to rainbow trout fingerlings in a pond. A sample of the weights of 40 trout revealed that the mean weight is 402.7 grams and the standatd deviation 8alE8 gr. What is the probability that the mean

50. ## chemistary

Explain the words element compound and mixture. Identify which substances ara element compound and mixture

51. ## Algebra 1

To train for a race, Will begins by jogging 11 minutes one day per week. He increases his jogging time by 5 minutes each week. Write the general term of this arithmetic sequence, and find how many whole weeks it takes for him to reach a jogging time of one

52. ## Algebra

Solve the problem. A salesperson gets a commission of \$600 for the first \$10,000 of sales, and then \$300 for each additional \$10,000 or partial of sales. Let S(x) represent the commission on x dollars of sales. Find the value of S(45,000)

53. ## English1

Underline the correct pronoun of each pair in parentheses. 1. Women (who, whom) raise families do as much work at home as at their jobs. Whom 2. In North America society, it is still mainly women (who, whom) cook dinner, clean the house, check the

54. ## Social Studies

What are 6 significant events important to Americans that occurred during World War II?

55. ## physics

when you connect an unknown resistor across the terminals of a 1.50 V AAA battery having a negligible internal resistance, you measure a current of 18.0 mA flowing through it .A)what is the resistance of the resistor. B) if you now place the resistor

56. ## physics

a 500.0 ohm resistor is connected in a series with a capacitor.what must be the capacitance of the capacitor to produce a time constant of 2.00 s

57. ## Calc

Express the integral as a limit of Riemann sums. Do not evaluate the limit. ∫_1^3 x/(2+x^5) Ans: lim(n→∞)∑_(i=1)^n ?

58. ## Physiology

The amount of DNA (measured in ng per mg ventricle) decreased. One nucleus is present in each vertebrate myocardial cell (each cell is mononucleated). Explain how it is possible that a decrease in mass-specific DNA concentration indicates growth of

59. ## MATH

what is the probability of getting 3 of a kind in poker? 3 of a kind is: Any three cards of the same rank with two other different cards. I know the answer it suppose to be 54912/2598960 But how do you get that?

60. ## Physics

A tsunami, a great ocean wave, travels a distance of 7.2x10^6m in 2.88x10^4 what is the average speed of tsunami?

61. ## Chemistry

Can someone tell me if this makes any sense or if I need to start over. I am not sure if it even answers the question. Why is the benzene molecule represented as “a flat cyclohexane with a ring inside?” The benzene molecule is represented as “a flat

62. ## Math - Statistics

Accrotime is a manufacturer of quartz crystal watches. Accrotime researchers have shown that the watches have an average life of 32 months before certain electronic components deteriorate, causing the watch to become unreliable. The standard deviation of

63. ## math

The cable in the center portion of a bridge is supported as shown in the figure to form a parabola. The center support is 10 feet high, the tallest supports are 210 feet high, and the distance between the two tallest supports is 400 feet. Find the height

64. ## Physics

Can anyone explain this? If the particles in the upper atmosphere have a very high temperature (when using the definition that relates temperature to kinetic energy), why would the measured temperature be very low?

65. ## Physics

1. Given a liter of water just at boiling, how much energy does it take to boil it all? 2. If that liter of water was originally at 10°C, how much extra energy would it take to boil the water? Would it be: 1. Q=mL=(1kg)(2.26e6)=2.26e6 2.

66. ## Physics

If you have an ideal spring with a mass m on it, and you measure a spring constant of 8 N/m, what do you expect to happen to the spring constant if you (be realistic): a. Take it to the moon b. Take it to the sun Would the constant remain the same for both

67. ## Physics

If you take a boat from earth and put it on a planet with twice earth's gravity, what would happen if you tried to float it in water?

68. ## Math

Let's say I had a graph for some experiment that we thought was modelled by a = bcd + g. If we perform an experiment and plot a vs. c, what do we expect the slope and intercept to be? Would intercept = g and slope = b ? If that's right, what would d

69. ## Physics

A bouncy rubber ball and a squishy mud ball were thrown at a wall. The mud ball stuck, and the rubber ball bounced back off. Which transferred more momentum to the wall (i.e., which experienced the largest change in momentum)? The balls have identical

70. ## Physics

Question from lab regarding Conservation of Energy Why doesn't the potential energy of the pulley matter when calculating the change in energy of our system?

71. ## Algebra

Where do I put parenthesis and brackets to make this true 14-12/3+5•8=-58

72. ## Physics

You are launching Robin Hood out of a cannon and over the wall of the castle to rescue the Maid Marion. He would like to clear the castle wall by as much as possible. The cannon is stuck at an angle of 45 degrees from the ground and will launch him with a

73. ## Algebra

The mass of Earth is about 3 × 10-3 times the mass of Jupiter. The mass of Earth is about 6 × 10 24 kg. What is the mass of Jupiter? Give your answer in scientific notation.

74. ## Math

I have two numbers that have a sum of 16 and a difference of 3. By forming two equations and solving them find the two numbers.

75. ## Chemistry

In order to determine the concentration of a solution of Carbonic Acid (H2CO3), a sample was placed in a buret and titrated with 0.1132 M Sodium hydroxide. For the carbonic acid, the initial reading was 11.0ml and final reading was 31.0 ml. For sodium

76. ## Math

Explain how you can used a grid to subtract 1.65-0.98

77. ## Physics

If a ball is dropped from a height of 100.0 m, what is it's height above the ground (in meters) after 3.0 s? If a ball is dropped from a height of 100.0 m, what is it's velocity (in m/s) after 3.00 s? You may treat downward velocity as positive.

78. ## physics

a 20 kg crate is at rest on level ground a worker begins pushing horizontally on the crate with a force 300 Newtons, but the crate does not move determine the weight of the crate in both units of newtons and units of and units of pounds, determine the

79. ## physics

a woman who weighs 150 lb. on earth would weigh 340 lb. on another planet, what is her mass on earth, what is her mass on the other planet, what is the magnitude of the gravitational field on the other planet

80. ## Calculus

If x^2 + y^2 = 25 and dx/dt = 8, find dy/dt when x=3.

81. ## Math

An observer atop a cliff sees a speedboat approaching a dock located at the base of the cliff directly below the observer. Express the distance, d, from the observer tot he boat as a function of the distance, x, from the boat to the dock, if the cliff is

82. ## physics

A 43.0-kg boy, riding a 2.20-kg skateboard at a velocity of 5.30 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 6.00 m/s, 8.00° above the

83. ## Chemistry

Calculate the theoretical amount of .5M NaOH that it would take to neutralize approx. 2.0 g KHP. KHP is a monoprotic acid, the molar mass of KHP is 204.22 g/mol and the molar mass of NaOH is 40.00 g/mol. Answer in terms of mL. I converted g KHP to mols,

84. ## MATH HELP

The Francesco Company produces spaghetti sauce that is used in restaurants. The fixed costs total \$1,329,050. The selling price per 64 oz. can of sauce is \$12.40. The variable cost per can is \$4.80. What is the break-even point in number of cans?

85. ## Math Algebra PLEASE EXPLAIN

Ferguson Financial Advisers Inc. (FFAI) allocates 76% of its annual budget to employee compensation. FFAI spends \$1,345,000 annually on employee compensation. What is the annual budget of FFAI?

ATCE Learning Center would like a possible net profit of \$650,000 on its new resource manual it sells to schools. The fixed costs for producing the manual are \$780,000 and the variable cost per package is \$19.85. If the estimated unit sales are 1,250,000

Future Sporting Goods has traditionally had about 25% of the retail business in Martin County. The total estimated sporting goods business in the county for next year is \$15,430,000. What sporting goods business can Future project for next year? I CANNOT

Top Kitchens handles 17% of all the kitchen production in the area for new construction. It is estimated that the cost of kitchens is 14% of the total cost of constructing a new house. New home construction in the area for the next year is estimated to

Lansing Bookery regularly marks up books 40% of the selling price. The bookstore's cost on a new best-selling book is \$12.95 per book. What is the selling price of this book? 21.58 33.21 32.38 18.13

90. ## MATH HELP PLEASE Explain

Toolbox:\$5.16; markup 40% of the selling price. What's the selling price?

91. ## MATH HELP

a company carries an \$630,000 inventory. The company estimates the annual cost of carrying the inventory at 35% of the ihe inventory value. What is the approximate ANNUAL cost of carring the inventory?

92. ## Algebra

The volume of a right circular cylinder (think of a pop can) is jointly proportional to the square of the radius of the circular base and to the height. For example, when the height is 10.62 cm and the radius is 3 cm, then the volume is 300 cm3. Find the

93. ## Math

If there are 24 books on a shelf and 2/3 are fictional, how do I solve to to find out the number that are fictional

94. ## Math CALCULUS HELP PLEASE

Tidal volume is the volume of air displaced in the lungs between inhalation and exhalation (the amount of air in a breath). The residual volume is given by the amount remaining in the lungs even after the deepest exhalation (i.e. the minimum amount of air

95. ## Finite Math

An urn contains 8 blue marbles and 7 red marbles. A sample of 6 marbles is chosen from the urn without replacement. What is the probability that the sample contains at least one blue marble?

96. ## Chemistry

1) A saturated solution of the slightly soluble salt MA3 is 1.4 ×10^–3 M in MA3. What is its Ksp value? 2) A 20.0 mL sample of NaIO3 was treated with an excess of KI and HCl and the iodine produced titrated with 0.05125 M Na2S2O3. 19.35 mL of Na2S2O3

97. ## Chem

1) A saturated solution of the slightly soluble salt MA3 is 1.4 ×10^–3 M in MA3. What is its Ksp value? 2) A 20.0 mL sample of NaIO3 was treated with an excess of KI and HCl and the iodine produced titrated with 0.05125 M Na2S2O3. 19.35 mL of Na2S2O3

98. ## Math

If 2/3 pound of candy costs \$7 how much does 1 pound of candy cost?

99. ## Geology

rate of change