Jawabanmu

2014-04-06T19:20:07+07:00
H(t) = 40t - 5t^2 = 40 -10t = 40=10t ----> t= 4 , h(4) = 40 (4) -5(4)^2 = 160 -80 = 80m semoga dapat membantu....^^
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