Using the commutative property, what would be the equivalent expression for 5+6= ?

How do you use the elimination method for this question? explain, because i really want to understand!

Adriveway is 40 yards long about how many meters long is it

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