Please help me answer that asap :) :D

Aswim teacher sells lesson packages. the best deal has the highest ratio of lessons to total cost.swim lesson packagesnumber of lessons total cost$10$4010 1 $8015$80which package is the best deal? l lesson for $105 lessons for $4010 lessons for $8015 lessons for $80mark this and returnsave and exit

Factor the expression using gcf 9b+45

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?