The cost, in dollars, of producing x belts is given by C(x) = 634 + 18x - 0.071 x^2. Find the rate at which average cost is changing when 324 belts have been produced. When 324 belts have been produced, the average cost is changing at for each additional belt.

When 324 belts have been produced, the average cost is changing at -28 dollars for each additional belt.

Step-by-step explanation:

The cost of producing x belts is given by:

Find the rate at which average cost is changing when 324 belts have been produced.

This is . So

So the correct answer is:

When 324 belts have been produced, the average cost is changing at -28 dollars for each additional belt.

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