I need help with this.

Given a(-12,5) and b(12,29) find the point that divides the line segment ab three-eighths of the way from a to b

Joanie watched 1 out of three of a movie in the morning

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