Since its an octagon, there's 8 sides. Each side is 2 feet long. Since you are trying to find the perimeter of the sign, you would multiply 8x2. So Mandy will use 16 feet of tape on each stop sign.
All you have to do is 8 * 2, because an octagon has 8 sides.
8 * 2 = 16
Hope this helps!
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