Question

After t seconds a ball thrown in the air from ground level reaches a given

height (h) in feet. Given the equation h = -1612 + 144 + 100 at what time does the
ball reach 100 feet?

Answer 1

9 sec.

Explanation:

I think you wrote the equations incorrectly. It probably is

`h = -16t^(2) + 144t + 100`

If that is true, then
`100 = -16t^(2) + 144t + 100`

0 = -16
`t^(2)` + 144t

-16t(t - 9) = 0

t = 0 or t = 9