1. For a certain product, the revenue is given by R = 40x and the cost is given by C = 20x + 1600. To obtain a profit, the revenue must be greater than the cost. For what values of x will there be a profit? Graph the solution.
2. Thrift rents a compact car for $33 per day, and General rents a similar car for $20 per day plus an initial fee of $78. For how many days would it be cheaper to rent from General? Graph the solution.