Question 838355
The equation is h(t)= -16t^2+80t. (h for feet and t for seconds). The question asks how much time it takes for the ball to reach 96 feet. I tried plugging 96 in for h(t) and then subtracting it and inserting it on the other side. I factored, but got t=3 and t=2. I don't think I am supposed to get two positive numbers.
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Check your answers.
h(t)= -16t^2+80t
h(2) = -16*4 + 80*2 = -64 + 160
h(2) = 96  That's correct.
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h(3) = -16*9 + 80*3 = -144 + 2400
h(3) = 96 Also correct.
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It goes up thru 96', then it comes down.