Margot is sewing a ribbon on a seam along the perimeter of a square pillow. the side length of the pillow is 2x2 + 1 inches, and its perimeter is 4(2x2 + 1) inches. if x = 3.5, how much ribbon does she need?

She needs 102 inches ribbon to sew a ribbon on a seam along the perimeter of a square pillow based on the information on the question above. This problem can be solved by substituting the x value to the square side equation (2*(3.5)^2+1=25.5). Therefore, we must find the perimeter of the square pillow using the square perimeter formula (25.5*4=102).