REALLY NEED HELP!
A firecracker shoots up from a hill 165 feet high with an initial speed of 110 feet per second. Using the formula H(t) = -16t2 + vt + s, determine how long it will take the firecracker to hit the ground.

Question

REALLY NEED HELP! 
A firecracker shoots up from a hill 165 feet high with an initial speed of 110 feet per second. Using the formula H(t) = -16t2 + vt + s, determine how long it will take the firecracker to hit the ground.

anonymous · Answer

plz help!

anonymous · Answer

initial speed is 110, initial height is 165 so your formula is
h(t) = -16t^2 + 110 t + 165

anonymous · Answer

to get the time it takes to reach the ground , solve for t here:

0 = -16t^2 + 110 t + 165

anonymous · Answer

since this is a quadratic, you'll get two values of t (time)... you can ignore the value of t that does not make sense in this world we call reality ...

anonymous · Answer

:)

anonymous · Answer

thx :)

compassionate · Answer

Upon analysis this quadratic polynomial does not factor so you will need to use the quadratic formula.

t should be a little more than 8 seconds. Good Luck!

8.1 isn't accepted on most standardize test. The correct answer is 

$$t \approx 8$$