I've been looking in the study guide but can't find how to solve it

Solutions for 2x+7 less than or equal to 3x-5

Find the distance between (0,5) & (-4,2)

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