There is no solution to the equation.
The x is cancelled out.
See attachment file below.
Hope it helped!
I believe the answer is B.) 120 because 170 is much wider than the CFE so it needs to be lower than that but not to much lower which is where 120 would come in.
25 = -16t^2 + 50t + 4
16t^2 - 50t + 21 = 0
16t^2 - 8t - 42t + 21 = 0
8t(2t - 1) - 21(2t - 1) = 0
(8t - 21)(2t - 1) = 0
8t - 21 = 0 or 2t - 1 = 0
t = 21/8 or t = 1/2
t = 2.625 or t = 0.5
I had to google this one and got 17...