Question 275417
A rock falls from a tower that is 304 feet high.  As it is falling, its height is given by the formula h=304-16t^2.  How many seconds(in tenths) will it take for the rock to hit the ground (h=0)? (I believe you just set H=0 and then solve? Is  that correct?)

Yes

16t^2+h-304 =0

use the formula x1, x2 = -b (+, -) sqrt(b^2-4ac) / 2a

a=16, b=1 c=-304

b^2-4ac= 1-19456

= - 1 + sqrt( 19455)  / 2*16

= -1+ 139.48  /32

= 138.48 /32
= 4.32 

Similarly find x2 and it will be -4.39

So t=4.32 seconds