Some one please help!! I just want to know how to do this!! I will give a medal and I will fan! And I really will!

Former MLB pitcher Nolan Ryan was once recorded throwing a fastball at 100.9 mph (148 ft/s). If Nolan Ryan were to throw this high-speed pitch straight up from an initial height of 7.8 ft, how long would it remain in the air, ignoring air resistance? Use the formula h=-14t^2+148t+7.8 where h is the height of the ball in feet and t is the time in seconds since it is pitched. Round your answer to the nearest tenth.
A.

0.1 seconds
B.

2.8 seconds
C.

3.2 secon

Question

Some one please help!! I just want to know how to do this!! I will give a medal and I will fan! And I really will!

Former MLB pitcher Nolan Ryan was once recorded throwing a fastball at 100.9 mph (148 ft/s). If Nolan Ryan were to throw this high-speed pitch straight up from an initial height of 7.8 ft, how long would it remain in the air, ignoring air resistance? Use the formula h=-14t^2+148t+7.8  where h is the height of the ball in feet and t is the time in seconds since it is pitched. Round your answer to the nearest tenth.
A.
	
0.1 seconds
B.
	
2.8 seconds
C.
	
3.2 secon

welshfella · Answer

when the ball lands it will have height h = 0  
so you need to solve

 -14t^2+148t+7.8 = 0

tlynne16 · Answer

so you just set the equation to zero?

welshfella · Answer

yes

one root will be negative and can be ignored. The other will be the correct time in the air.

tlynne16 · Answer

Could you help me with another one?

welshfella · Answer

sorry i have to go right now

tlynne16 · Answer

that's okay but thank you!