CALCULUS!
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When S is sales and t is time, and the original function is S(t), what does S'(24) and S''(24) represent?

When S is sales and t is time, and the original function is S(t), what does S'(24)>0 and S''(24)<0 represent?

s'(24)>0 means that sales at time 24 is increaseing
s"(24)<0 means that the rate of increasing sales at time 24 is decreasing.
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