At the start of a basketball game, the referee tosses a ball into the air for the jump ball. The equation that models the height of the ball is h(t) = -16t2 + 30t + 8. During what time interval is the height of the ball above 10 feet? (Round your answer to the nearest tenth of a second.)
a) Between 0.1 and 1.8 seconds
b) Between 1.1 and 1.6 seconds
c) Between 0.3 and 2.1 seconds

Question

anonymous · Answer

set your function h(t)=10 and solve for t.  You'll get 2 answers.  The time interval is the time between those values.