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?

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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?

Mathematics
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A. 8 sec B. 9 C. 10 D.11
Does this deal with quadratic...?

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@pandaecat check ur messages
ok ty!
np yw
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.
H(t)=-16t2+110t+150=0 then?
substitute v=110, s=150 and solve the resulting quadratic.
Oh I see! ty too
You're welcome! :)

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