The perimeter of a poster is 20 feet. The poster is 6 feet tall. How wide is it? Assumptions and givens: The poster has a rectangle shape l = 6 P = 20 The perimeter of a rectangle (P) is: 2l + 2w = P Plugging in our l and P values, we get: 2(6) + 2w = 20 Multiplying through and simplifying, we get: 12 + 2w = 20 To solve for w, we type this equation into our search engine and we get: w = 4