Solve.The amount of water used to take a shower varies directly as the amount of time that the shower is in use. A shower lasting 20 minutes requires 12 gallons of water. Find the amount of water used in a shower lasting 12 minutes.
A. 6.6 gal
B. 240 gal
C. 7.2 gal
D. 7.8 gal
Answer: C
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Find the mean. Round to the nearest tenth unless otherwise stated.Retirement ages of teachers: 51, 63, 64, 56, 67, 58, 68, 53, 57
A. 59.7 B. 58.4 C. 59 D. 58
The graph of y = ax2 + bx + c is given in the figure. Solve the equation 
A. x = 3
B. x = 0
C. x = ±
D. x = -3
Find the square root.
A. -264 B. 23 C. -23 D. Not a real number
Let g(t) = 100 - 100e-0.01t be the number of cases of measles in a certain school t days after the first case is reported. Which of the following best describes the spread of the disease?
A. The number of cases decreases according to exponential decay. B. Initially, the disease spreads quickly, but then the rate of increase slows so that the number of cases never exceeds 100. C. After the first day there are 100 cases, after which the number of cases decreases daily to 0. D. The disease spreads quickly until the number of cases reaches 100; then gradually the number of cases decreases. E. none of these