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.
A. 12°C
B. 4°C
C. 20°C
D. 8°C
Answer: A
Mathematics
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Use the Pythagorean Theorem to find the missing side of the right triangle.
A. 
B. 
C. 
D. 57
Mathematics
Solve the system of equations by substitution.5x + 3y = 802x + y = 30
A. (10, 0) B. (0, 10) C. (10, 10) D. (-10, 10)
Mathematics
Solve the inequality.
< x
A. (3, 6) B. (-?, 3) or (6, ?) C. (0, 3) or (6, ?) D. (6, ?)
Mathematics
Find the reciprocal.-15
A. The number -15 has no reciprocal.
B. 
C. 
D. 15
Mathematics