-9m+81-m^2+9m = 81 - m^2 (final answer since -9m and 9m cancels each other out)
Answer:
9.8
Step-by-step explanation:
Of means multiply
14% * 70
Change to decimal form
.14 * 70
9.8
One solution let's find that
H'(x)=-32t+64, the only zero of that is 2, and it goes from positive to negative, so the maximum height will be at time 2. Plug in 2 to the original equation and that gives you 144. The max height is 144 feet.