If a= 4 units and b=3units, the length of the diagonal of the outside square rounded to the nearest tenth is. Units and the length of the diagonal of the inside square rounded to the nearest tenth is units

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