Simplify the expression

An explanation would be greatly appreciated

Find two rational expressions that have the difference of 2-n/n-4

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

What is the measure of the smallest angle in the diagram? 15 29 32 45