Solve the problem.For the total-revenue functionR(x) = 6x,find ?R and R'(x) when x = 80 and ?x = 1.

A. ?R = $12.00; R'(80) = $6.00
B. ?R = $3.00; R'(80) = $3.00
C. ?R = $6.00; R'(80) = $6.00
D. ?R = $12.00; R'(80) = $12.00


Answer: C

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