Answer:
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Multiply it by its self 3 times for example 2 to the square root of 3 2x2x2
Let h be the numbers of hours, f be the one-time fee and c the cost charged. The equation is

Since you pay $15 per four, plus the fee. We can solve this equation for the fee:

If we plug c=195 and h=9, we have

The heck, what math are you in?
The answer would be C because they say if 3 new students arrived each year.