They represent the two times the football is on the ground.
N=3
Distribute them at the numbers, add 30 to both sides of the equation then simplify. Then add 14 to both sides of the equation. Simplify again. Divide both sides of the equation by the same factor. Simplify. Answer is n=3
The graph of
is given by,
Here given the function is 
when
, then it passes through the origin (0,0).
When 
Since we know that,
, then the function has maximum height at
.
Again when
, again the function is 0.
So clearly the function is the Oscillating function.
Using graphing calculator we get the graph of function
,
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The third one is the answer