Question

15 POINTSSSS!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Suppose this firework is set to explode 3 seconds after it is launched. At what height will this firework be when it explodes?
My equation is h(t)=-16t^2+120t+20

How do I do this?

Answer 1

The correct answer is 523m. Hope this helps. Please tell me if i'm right or wrong.

Explanation:

Answer 2

You sub in t=3

So h(t) = 16t^2 + 120t + 20

h(3) = 16(3)^2 + 120(3) + 20

= 16*9 + 360 + 20

= 144 + 360 + 20

= 524m