Solve the problem.The cost of manufacturing clocks is given by C(x) = 72 + 62x - x2. Also, it is known that in t hours the number of clocks that can be produced is given by x = 9t, where 
Express C as a function of t.
A. C(t) = 72 + 558t - 81t
B. C(t) = 72 + 62t + t2
C. C(t) = 72 + 558t - 81t2
D. C(t) = 72 + 62t - 9
Answer: C
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Use the substitution formula to evaluate the integral.
dx
A. 
- 
B. 5
- 8
C. 
- 
D. 
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Perform the indicated operations.(500)(40,000)
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