Pls help with 15 and 18( ignore the b it’s for another problem) pls show how you set up the problems

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

Aphrase is shown read the phrase and give me the answer

What is the factor form of x^2-9x+14