Question

Help mee pleaseeee!!!!!!!!!!!!!!!!!!!!!!!!




thank youuu

Answer 1

8.29 s

Explanation:

Well, when the pebble hits the ground, h = 0

so 0 = -16t^2 +24t + 900

Use quadratic Formula with a = -16 b = 24 and c = 900

to find t = 8.29 seconds

(ignore the negative value that the Quad Formula computes)