Solve the problem.For the total-cost functionC(x) = x3 - 8x2 + 6x + 50,find ?C and C'(x) when x = 50 and ?x = 1.
A. ?C = $6,849; C'(50) = $6,706
B. ?C = $6,899; C'(50) = $6,706
C. ?C = $6,799; C'(50) = $6,706
D. ?C = $6,849; C'(50) = $6,700
Answer: A
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Rewrite the rational expression as an equivalent rational expression with the given denominator.
= 
A. 
B. 
C. 
D. 
Solve the equation.12y2 + 35y + 25 = 0
A. y = - 
, - 
B. y = 
, 
C. y = - 
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D. y = 
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Solve the problem.An investment is worth $2864 in 2013. By 2018 it has grown to $4254. Let y be the value of the investment in the year x, where x = 0 represents 2013. Write a linear equation that models the value of the investment in the year x.
A. y = 
x + 2864
B. y = -278x + 5644
C. y = -278x + 2864
D. y = 278x + 2864
Solve the problem.A circular swimming pool, 20 feet in diameter, is enclosed by a circular deck that is 4 feet wide. What is the area of the deck? Use ? = 3.1416.
A. 301.6 ft2 B. 584.3 ft2 C. 314.2 ft2 D. 703.7 ft2