Which number is the smallest? a) 1.28 x 10-4 eliminate b) 2.85 x 10-6 c) 3.24 x 10-5 d) 5.48 x 10-8

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