Solve the problem.The cost of manufacturing clocks is given by C(x) = 68 + 21x - x2. Also, it is known that in t hours the number of clocks that can be produced is given by x = 2t, where  Express C as a function of t.

A. C(t) = 68 + 42t - 4t
B. C(t) = 68 + 42t - 4t2
C. C(t) = 68 + 21t + t2
D. C(t) = 68 + 21t - 2


Answer: B

Mathematics

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