Which of the following is NOT linear?
A. The total weight of a jar of pennies as more pennies are added to the jar.

B. The distance traveled by a car moving at a constant speed over time.

C. A truck drivers salary of $2500 a month plus $0.50 for every kilometer driven.

D. The height of a football thrown over time.

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