Line segment NY has endpoints of N(-11,5) and Y(5,-7). What is the equation of the perpendicular bisector of NY?

To prove p is equal to q using an indirect proof what would your starting assumption be?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Mr. roseanne will buy 12 1/2 pounds beef for for a cookout. the price for the first 3 pounds of beef is $4.99 per pound. after that, the price is $4.49 per pound. how much will mr.roshan pay for the beef