Solve the problem.Total profit P is defined as total revenue R minus total cost C, and is given by the function 
Find the total profit P(x) if 
and 
A. P(x) = 0.3x2 + 210x - 8000
B. P(x) = 0.7x2 + 210x + 8000
C. P(x) = -0.7x2 - 210x - 8000
D. P(x) = -0.7x2 + 210x - 8000
Answer: D
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Solve the problem.Consider the graph of f shown in the figure. Find the area function A(x) = 
where A(x) is the area of the shaded region, for 
and 
A. A(x) = 13(x + 9) B. A(x) = 13x + 9 C. A(x) = 13(9 - x) D. A(x) = 13(x - 9)
250 students in a math class take the final exam. The scores on the exam have an approximately normal distribution with mean ? = 75 and standard deviation ? = 10.Peter's score on the exam places him in the 16th percentile of the class. Peter's score on the exam is approximately
A. 55. B. 45. C. 16. D. 65. E. none of these
Solve the equation.9x = 813x + 5
A. - 2
B. 2
C. - 
D. - 
Factor the trinomial completely. If the trinomial cannot be factored, say it is prime.m2n2 + 7mn + 12
A. (mn + 4)(mn - 3) B. (mn + 4)(mn + 3) C. (mn - 4)(mn + 3) D. (m + 4)(n + 3)