Assume the local fitness club charges a membership fee of \($30\) per month for unlimited use of the exercise equipment plus an additional fee of \($5\) for every instructor-led exercise class you attend.

1. Express the monthly cost of belonging to the fitness club as a cost equation.

2. What is your expected cost for a month in which you attend five instructor-led classes?

3. If your attendance doubles to 10 classes per month, will your total cost for the month double? Explain.