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 1.1 and 1.6 seconds
b) Between 0.3 and 2.1 seconds
c) Between 0.1 and 1.8 seconds
?

Question

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 1.1 and 1.6 seconds 
b) Between 0.3 and 2.1 seconds 
c) Between 0.1 and 1.8 seconds 
?

anonymous · Answer

Set the equation to 10

anonymous · Answer

10=-16t^2+30t+8

anonymous · Answer

Let me know if you need help solving

amistre64 · Answer

since it starts at a height of 8; we can also just subtract 2 and solve for 0 right?

amistre64 · Answer

-16t2 + 30t + 6 = 0 will be the time when it is at 10 methinks

anonymous · Answer

so what would the answer be? a?

anonymous · Answer

at least try solving

amistre64 · Answer

the roots for -16t^2 +30t -2 are:  .07 to 1.8