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17 September, 05:26

The function d (t) = -2t^2+9t+18 most closely represents the height (h) of the golf ball in feet after t seconds. How long is the golf ball in the air?

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  1. 17 September, 05:39
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    Step-by-step explanation:

    d (t) = -2t^2+9t+18

    calculate the derivate : f' (t) = - 4t+9

    f' (t) = 0 : - 4t+9 = 0 so t = 9/4

    the maximum value is f (9/4) = ... continue
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