Solve the problem.S(x) = -x3 + 6x2 + 288x + 4000, 4 ? x ? 20 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. Round to the nearest tenth, if necessary.
A. 8°C
B. 12°C
C. 20°C
D. 4°C
Answer: B
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Solve the problem.A private shipping company will accept a box for domestic shipment only if the sum of its length and girth (distance around) does not exceed 90 in. Suppose you want to mail a box with square sides so that its dimensions are 
and it's girth is 
What dimensions will give the box its largest volume?
A. 15 in. x 15 in. x 30 in. B. 30 in. x 15 in. x 30 in. C. 20 in. x 20 in. x 15 in. D. 15 in. x 15 in. x 75 in.
Find the mode or modes for the set of numbers.5, 9, 21, 3, 2, 8, 29, 1, 4, 16
A. 9 B. No mode C. 9.2 D. 8
Find the length of the missing side in the right triangle.
a = 
, b = 
; find c
A. 
B. 
C. 85
D. 13
Use addition to check the subtraction problem. If the answer is incorrect, find the correct answer.
A. Incorrect; should be 6474 B. Incorrect; should be 7464 C. Incorrect; should be 6564 D. Correct