Answer:
9 feet
Step-by-step explanation:
The height of the ball in feet is given by the polynomial:

where t is the time in seconds.
After 3 seconds, t = 3:

The height of the ball after 3 seconds is 9 feet.
Answer:
30 and -30 and if that doesn’t work then maybe try -30 first and 30 next
<span>Its speed is 18.05 m/s</span>