Refer to the double-bar graph below which shows the number of male (M) and female (F) athletes at a university over a four-year period. Solve the problem. 
YEARHow many students were involved in athletics in 1989?
A. 800
B. 775
C. 750
D. 825
Answer: A
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A tamoxifen study claims that a combination of chemotherapy and the hormone therapy tamoxifen is more effective than tamoxifen alone in preventing breast cancer. In the study, a group of researchers from the U.S. and Canada studied 1477 postmenopausal women with early-stage breast cancer. The women were randomly assigned to one of three study groups. Group A (361 patients) received tamoxifen alone on a daily basis for five years. Group B (566 patients) received chemotherapy and tamoxifen for six months, and then completed five years of tamoxifen treatment. Group C (550 patients) received chemotherapy alone for six months followed by five years of tamoxifen treatment. All 1477 patients knew which treatment they were receiving.This study is
A. not an experiment. B. double-blind. C. blind, but not double-blind. D. not blind. E. none of these
Solve.Suppose the dollar cost to produce n items in a factory is 
Furthermore, the number of items n produced in x hours is 
Find c[n(x)], which is the composite function that defines the dollar cost in terms of the number of hours of production x.
A. c[n(x)] = 18x + 8 B. c[n(x)] = 18x + 48 C. c[n(x)] = 9x + 48 D. c[n(x)] = 9x + 8
Solve the problem.A faucet is used to add water to a large bottle that already contained some water. After it has been filling for 5 seconds, the gauge on the bottle indicates that it contains 30 ounces of water. After it has been filling for 13 seconds, the gauge indicates the bottle contains 70 ounces of water. Let y be the amount of water in the bottle x seconds after the faucet was turned on. Write a linear equation that models the amount of water in the bottle in terms of x.
A. y = -5x + 55
B. y = 5x + 5
C. y = 5x + 57
D. y = 
x + 29
Solve the problem.The half-life of plutonium-234 is 9 hours. If 70 milligrams is present now, how much will be present in 5 days? (Round your answer to three decimal places.)
A. 0.007 B. 47.627 C. 27.779 D. 1.488