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)
.5 seconds to 2.1 seconds
b)
.2 seconds to 1.3 seconds
c)
.6 seconds to 1.8 seconds
d)
.4 seconds to 1.9 seconds

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)	
.5 seconds to 2.1 seconds
	b)	
.2 seconds to 1.3 seconds
	c)	
.6 seconds to 1.8 seconds
	d)	
.4 seconds to 1.9 seconds

anonymous · Answer

b) .2-0.3

anonymous · Answer

it was actually c but thanks anyway:)

anonymous · Answer

Could you tell me how you got that? Because I got the answers as 0.19 and 1.31

anonymous · Answer

Use your graphing calculator to graph the original equation. Then graph the line y = 10. If you find the two intersection points, the x-values are the times.
The answer is between 0.1 and 1.8 seconds.

anonymous · Answer

Thank you!