need calculus help Total Cost

Calculus
Tutor: None Selected Time limit: 1 Day

the total cost for soni corp to manufacture DVD players is given by f(x) = 6x^3 - x^2 + 7x + 90, where x represents DVDs

find marginal cost for sony corp when it manufactures 5 DVDS 

I got 447?

A. 447

B. 537

C. 337

D. 737

Apr 13th, 2015

the total cost for soni corp to manufacture DVD players is given by f(x) = 6x^3 - x^2 + 7x + 90, where x represents DVDs

f'(x) = 18x^2-2x+7 

at x = 5 it is 

f'(5) = 450-10+7 = 447


Apr 13th, 2015

Yay i got that. Thank you!

Apr 13th, 2015

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