Akio buys scissors for 3.79, tape for 2.57, and pens for 5.80.the sales tax is 6.25percent what is the amount of tax for akios purchases

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