Which pair of expressions are equivalent? 2y minus four and 2y minus four plus 9, 14x minus seven and 7x minus fourteen, 9y plus 3 plus two and 3(y plus one) plus two, x plus y and x minus y plus 2y, x plus 2y and x minus y

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