Why do you need to convert units to measure to solve the problem?

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

Larry wants to buy some carpeting for his living room. the length of the room is 4 times the width and the total area of the room is 16 square meters. what is the length of the living room

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?