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

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Answer:
✖ both sides
Step-by-step explanation:
you take both numbers and you multiply it
Answer:
$19.38 per hour
Step-by-step explanation:
total cost $135.65 divided by 7 hours=$19.378 and then round up