To make things easier, we can assume a value of x in order to substitute to each expression and obtain the side length of each. We can calculate for perimeter of each square. Then, compare them. We do as follows:
Assume x = 4 Square A 2x - 7 = 2(4) - 7 = 1 P = 4(1) = 4
Square B -4x + 18 = -4(4) + 18 = 2 P = 4(2) = 8
Therefore, the perimeter of B is 2 than the perimeter of A.
She buys 2 boxes each week for a year (there is 52 weeks in a year) = 2 x 52 = 104 boxes per year if each box contains 8 granola bars...and she buys 104 boxes, then she buys: 104 * 8 = 832 granola bars