Solve the problem. Round to tenths where necessary.S(x) = -x3 + 3x2 + 189x + 1200, 2 ? x ? 9 is an approximation to the number of salmon swimming upstream to spawn, where x represents the water temperature in degrees Celsius. Find the temperature that produces the maximum number of salmon.
A. 9°C
B. 2°C
C. 3°C
D. 8°C
Answer: A
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Solve. Round to two decimal places unless otherwise noted.If the average cost per unit C(x) to produce x units of plywood is given by 
what do 400 units cost?
A. $292.68 B. $299.98 C. $12,000.00 D. $60.00
Evaluate the improper integral or state that it is divergent.
A. 1 B. Divergent C. 0 D. -1
Solve.A boat moves 5 kilometers upstream in the same amount of time it moves 18 kilometers downstream. If the rate of the current is 9 kilometers per hour, find the rate of the boat in still water.
A. 9 kilometers per hour
B. 6
kilometers per hour
C. 3
kilometers per hour
D. 15
kilometers per hour
Find the mean, median, mode, and midrange for the given data. Round to the nearest tenth if necessary.
A. mean = 23.2, median = 22.4, mode = 22.4, midrange = 24.15 B. mean = 23.2, median = 22.4, mode = 22.4, midrange = 6.7 C. mean = 23.2, median = 24.8, mode = 22.4, midrange = 24.15 D. mean = 23.7, median = 22.4, mode = 27.5, midrange = 6.7