Question

also can someone help me with this question?

The equation h=-16t²+56t models the height (h) in feet of a golf ball (t) seconds after it was hit what do i do next a find the values of t for which h=0 or B when the ball 40 ft above the ground?

Answer 1

\[h=-16t ^{2}+56t\]
when h=0 then \[-16t ^{2}+56t=0\] gies you t=3.5. because t=0 neglected.
and when h=40;
\[-16t ^{2}+56t=40\] \[2t ^{2}-7t+5=0\] gives you t=1 or 2.5