CLEP
A science class launched a rocket from level ground. The height 
, in feet, of the rocket above the ground 
seconds after it was launched can be modeled by the function 
. How many seconds did it take for the rocket to return to the ground?
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Correct Answer:
No
Correct Answer:
No
2
Correct Answer:
No
4
Correct Answer:
Yes
8
Correct Answer:
No