Solve the problem.S(x) = -x3 - 9x2 + 165x + 1300, 5 ? 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. 5°C
B. 6°C
C. 20°C
D. 19°C
Answer: A
Mathematics
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Factor the trinomial completely.x2 - x - 20
A. (x + 5)(x - 4) B. (x - 1)(x + 20) C. (x + 4)(x - 5) D. (x + 1)(x - 20)
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Simplify the algebraic expression.5x + 9y + 10 + 8x - 4y + 13
A. 18xy + 23 B. 13x + 13y + 23 C. 13x + 5y + 23 D. -3x + 13y + 23
Mathematics
Find the average of the list of numbers.79, 65, 48, 43, 72, 47
A. 59 B. 57 C. 60 D. 65
Mathematics
Solve using any appropriate method. If the system has an infinite number of solutions, use set-builder notation to write the solution set. If the system has no solution, state this.0.2x + 0.3y = 30.3x - 0.2y = 2
A. 
B. 
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D. 
Mathematics