重点是用英文怎么答

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重点是用英文怎么答

重点是用英文怎么答

重点是用英文怎么答
The meaning of the derivative f'(8) is the change rate of the quantity of the coffee sold at 8 dollars per pound with the change of the sale price by every pound.
The unit is pound(weight)/pound(price)
f'(8) is negative.
If the sales price increase the quantity will decrease.