<span> To find 55% of 120 books, multiply 120 x .55
Then add that answer to the original 120.</span>
120 + 55% = 186
Answer is 20 by plugging the 4 in the equation it equals 20
0=-16t^2 +64
0=-16(t^2 - 4)
0=-16(t-2)(t+2)
t=2 or - 2
It will take two seconds for the object to hit the ground.
