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(2x^2 + 1) inches. If x = 3.5, how much ribbon does she need?

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Given information
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Side length of a square = 2x² + 1
Perimeter of the square = 4(2x² + 1)

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If x = 3.5, find perimeter
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Perimeter of the square = 4(2(3.5)² +1)
Perimeter of the square = 4(2(12.25) +1)
Perimeter of the square = 4(24.5 +1)
Perimeter of the square = 4(25.5)
Perimeter of the square = 102 inches

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Answer: Margot will need 102 inches of the ribbon.
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