PLEASE HELP! I WILL MARK BRAINLIEST Which expression(s) have a greatest common factor (GCF) of 3xy^2 with 42xy^4?

A. 6x^2y^2

B. 15xy^2 z

C. 27x^3y^2

D. 9xy^3

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