After t seconds, the height h(t) of a model rocket launched from the ground into the air is given by the function below
h(t)= -16t^2 + 80t
How long does it take the rocket to reach a height of 96 feet?
A.) 1 seconds
B.) 6 seconds
C.) 2 seconds
D.) 101 seconds
Math help please help me ??
2016-03-30 7:06 am
回答 (2)
2016-03-30 7:36 am
✔ 最佳答案
given the height is h(t)= -16t^2 + 80t 96 = -16t^2 + 80t
16t^2 -80t +96 = 0
divide by 16
t^2 -5t + 6 = 0
factor
16 (t-3) (t-2) = 0
t=2 or t=3 both work
2016-03-30 7:07 am
B. 6 seconds
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