Question

I need help please..........

Answer 1

1.97 seconds

Explanation:

We Know

h = 70 - 4t - 16t²

h = the height

t = seconds

How long after the ball is thrown does it hit the ground?

We have

0 = 70 - 4t - 16t²

Factor out -2

-2(8t² + 2t - 35) = 0

Divide both sides by -2

(8t² + 2t - 35) = 0

Use the quadratic formula to find the solutions.

`\frac{-2±\sqrt{2^(2)-4 (8 (35) } }{2(8)}` ≈ 1.97

So, t ≈ 1.97 seconds.