Math help please!
A firecracker shoots up from a hill 140 feet high, with an initial speed of 100 feet per second. Using the formula H(t) = -16t2 + vt + s, approximately how long will it take the firecracker to hit the ground? (4 points)
Five seconds
Seven seconds
Nine seconds
11 seconds

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@gina123 @gina123

@Michele_Laino @ganeshie8

i think the answer is 7 seconds

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