Answer:
The answer is -1.
Step-by-step explanation:
It is a little messy tho. I will assume that you want 3-(4)
Answer:
The answer is D
Step-by-step explanation:
Answer:
It takes 3 seconds over the interval [0,3]
Step-by-step explanation:
To find when the roller coaster reaches the ground, find when d=0.

To solve divide each term by 16 and factor:

Solve for t by setting each factor to 0.
t-3=0 so t=3
t+3=0 so t=-3
This means the car is in the air from 0 to 3 second.