Answer:
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.
