Hey y’all, could you please help me answer these 2 questions. I would also like the working out please~ Thanks

Can some one me with these questions

With alll of except for the 2 that i did already

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