PLZ do all of it plz i will give brainlest and thanks to best answer

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

What function has a range {yly< 5}? question on picture above^