B. Multiplying both sides of the equation by 3
Answer:
18 hours
Step-by-step explanation:
9.99+x1.5=36.99
x=18
18*1.5=27
9.99+27=36.99
Check the picture below.
thus is at 0 = -16t² + 96t +640,

well, clearly it can't be a negative value for the elapsed seconds, so it can't be -4.
the only like-terms are on the right-hand-side, since the left-hand-side has only 1 term anyway.

Answer:
D answer to dis question is 21