Lin checks his bank account on Sundays and writes down how much money he has. The first week he has $15, the second week he has $21, and the fourth week he has $33. Is the amount of money in his account a function of the number of weeks? Explain your reasoning

Can someone me with my hwplz(only the circled ones)

We just started the introduction into circles and i have no idea how to do this.

Sam is a waiter at a local restaurant where he earns wages of $5 per hour sam figures that he also eams about $3 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 ehis total earings for the do o a. en) = 30 o b. en) = 5n+ 18