A firecracker shoots up from a hill 140 feet high, with an initial speed of 100 feet per second. Using the formula H(t) = -16t2 + vt + s, approximately how long will it take the firecracker to hit the ground?

Question

cwrw238 · Answer

0 = -16t^2 + 100t + 140
solve for t

anonymous · Answer

i don't know how to

cwrw238 · Answer

use the quadratic formula 

x  = [-b +/- sqrt(b^2 - 4ac) ] / 2a

where a b and c are the coefficients of t^2 , t and t^0

in this case a = -16 , b = 100 and c = 140.

anonymous · Answer

This is confusing

anonymous · Answer

I haven't done alg 1 in a while, this is an incomplete course from 8th grade

anonymous · Answer

could you just give me the answer? :/