Brian made a circular coaster from a square piece of wood as shown in the diagram below. The length of the square is 12cm. In terms of pi, what is the circumference, in centimeters, of the circular coaster?

In the problem, it was being given that the expression 10C + 15W +83.50 will be used and can be used when computing the total amount was able to save. It has an initial value of $83.50, then every time Millie cleans the car, she will be paid an amount of $10 and put this amount on her savings. It was also mentioned that Millie deposited an amount of $15 weekly and W is the number of total weeks. For example, Millie deposited for 4 weeks already so it means we have $15 times 4. If she cleaned the car 5 times already, it means we have $10 times 5.So the total savings is shown below:
Savings = 10*5 + 15*4 + 83.5
Savings = $193.5