Question

A firecracker shoots up from a hill 150 feet high, with an initial speed of 110 feet per second. Using the formula H(t) = −16t2 + vt + s, approximately how long will it take the firecracker to hit the ground?

Answer 1

A. 8 sec
B. 9
C. 10
D.11

Answer 2

@mathmate @Vocaloid @jayzdd @jcoury @freckles

Answer 3

Does this deal with quadratic...?

Answer 4

@pandaecat check ur messages

Answer 5

ok ty!

Answer 6

np yw

Answer 7

hint:
solve H(t) = −16t2 + vt + s = 0 where v=110, s=150
Ignore the negative root, and round the root to the nearest second.

Answer 8

H(t)=-16t2+110t+150=0 then?

Answer 9

substitute v=110, s=150
and solve the resulting quadratic.

Answer 10

Oh I see! ty too

Answer 11

You're welcome! :)