Alexander is a waiter at a restaurant. Each day he works, Alexander will make a guaranteed wage of $40, however the additional amount that Alexander earns from tips depends on the number of tables he waits on that day. From past experience, Alexander noticed that he will get about $10 in tips for each table he waits on. How much would Alexander expect to earn in a day on which he waits on 17 tables? How much would Alexander expect to make in a day when waiting on tt tables?