Is 7/10 greater than 1/2

Witch represents the inverse of the function f(x)=1/4x-12

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.

Geometry - finding area of regular polygons and sectors (check my math, i can’t find the error)