Solve the problem.S(x) = -x3 + 6x2 + 288x + 4000, 4 ? x ? 20 is an approximation of 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. 20°C
B. 12°C
C. 4°C
D. 8°C


Answer: B

Mathematics

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Solve the problem.The position of a weight attached to a spring is s(t) = -2 cos (6? t) inches after t seconds. What is the maximum height that the weight rises above the equilibrium position?

A.  in.
B.  in.
C. 6 in.
D. 2 in.

Mathematics

Find all complex-number solutions by completing the square.y2 - 4y = -28

A. -2 ± 2i
B. 2 ± 2
C. 2 ± 2i
D. 2 ± i

Mathematics

Determine the number that will complete the square to solve the equation after the constant term has been written on the right side. Do not actually solve.3x2 + x + 4 = 0

A.
B.
C. 36
D. - 

Mathematics

Solve the rational equation. -  = 

A.
B. -10
C. 10
D. 50

Mathematics