Question

At the start of the basketball game, the referee tosses a ball for a jump ball. The equation that models the height of the ball is
h(t) = -16t2 + 24t + 5
During what time interval is the height of the ball above 9 feet? (Round your answer to the nearest tenth of a second.)
a) .6 seconds to 1.8 seconds
b) .2 seconds to 1.3 seconds
c) .4 seconds to 1.9 seconds
d) .5 seconds to 2.1 seconds

Answer 1

9=-16t^2+24t+5

Answer 2

Solve for t