Help me solve this problem!

Mathematics
Tutor: None Selected Time limit: 1 Day

Oct 3rd, 2015

Thank you for the opportunity to help you with your question! Hope your day is going well!

Let's write down what we know, the equation for finding the cost is as follows

C(x)=847+14x-.076x^2

where x=the number of belts.

We need to take the derivative of the above equation to find the rate of average change. Thus the derivative is as follows (let me know if you want to know how to take derivatives).
C'(x)=14-.152x
Then substitute in x=400
C'(400)=14-60.8
            = -46.8
Thus they lose 46.8 dollars per belt.
Please let me know if you need any clarification. I'm always happy to answer your questions.
Sep 16th, 2015


Sep 16th, 2015
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Sep 16th, 2015

Hello thank you very much for ur help. the program said the answer is wrong. would you please try with this one thanks.

Sep 16th, 2015

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