Sam is a waiter at a local restaurant where he earns wages of $7 per hour. sam figures that he also earns about $5 in tips for each person he serves. sam works 6 hours on a particular day.
if n represents the number of people sam serves that day, which of the following functions could sam use to figure e, his total earnings for the day?
a. e(n)=5n
b. e(n)=7n+30
c. e(n)=5n+42