To participate in a bowling league, you pay a $25 sign-up fee and $12 for each league night that you
bowl. So, the total cost C (in dollars) is given by each equation C = 12x + 25 where x is the number of
league nights you bowled.

a. Solve the equation for x.

b. How many league nights have you bowled if you spent a total of $145? $181? $205