Answer:
12 seconds
Step-by-step explanation:
Given

Required
Determine the time taken to reach the ground
For the paper to reach the ground, y = 0
So, we have:


Collect Like Terms


Divide through by 2.5



<em>Hence:</em>
<em>Time taken is 12 seconds</em>
The Intercepting point and answer is: (1,-3)
The graph:
The answer is c, since the square root of 81 is positive or negative 9.
Hope this helps