According to the graph what is the value of the constant in the equation below rewritten in

Turner's mom measured his room to see how long the wallpaper border needed to be. if two walls are 15 feet long and two walls are 12 feet long, how long should the strip of border be cut?

Pls will give brainliest and all p.s u can zoom in if u cant see plss

17 in long 1.3 ft wide and 8in high what is the volume