74. Total cost. A company determines that its total cost, in thousands of dollars, for producing x chairs is C(x) = V5x + 60, and it plans to boost production t months from now ac- cording to the function x(t) = 20t + 40. How fast will costs be rising 4 months from now?

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74. Total cost. A company determines that its total cost, in
thousands of dollars, for producing x chairs is
C(x) = V5x + 60,
and it plans to boost production t months from now ac-
cording to the function
x(t) = 20t + 40.
How fast will costs be rising 4 months from now?
Transcribed Image Text:74. Total cost. A company determines that its total cost, in thousands of dollars, for producing x chairs is C(x) = V5x + 60, and it plans to boost production t months from now ac- cording to the function x(t) = 20t + 40. How fast will costs be rising 4 months from now?
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