Question: Advertising for a certain product is terminated, and t weeks later, the weekly sales are f (t) cases, where At what time is the weekly

Advertising for a certain product is terminated, and t weeks later, the weekly sales are f (t) cases, wheref(t) = 1000(1 + 8) 4000(+8)-.

At what time is the weekly sales amount falling the fastest?

f(t) = 1000(1 + 8) 4000(+8)-.

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