Ineed to know how much were spent on operating expenses

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.

Square a has a side length of (2x-7) and square b has a side length of (-4x+18). how much bigger is the perimeter of square b than square a?and show all work! you so

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)