Help me solve this problem!

Mathematics
Tutor: None Selected Time limit: 1 Day

Oct 3rd, 2015

Hello!

For function C(x) the rate of change is C'(x).

Here C'(x)=18-2*0.068*x=18-0.136*x.

Substitute x=400 as asked and obtain

18-0.136*400=18-13.6*4=18-54.4=-36.4.

Of course in dollars per belt.

Please ask if something is unclear.
Sep 16th, 2015

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Oct 3rd, 2015
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Oct 3rd, 2015
May 22nd, 2017
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