Stan wants to add trim all around the edge of a rectangular tablecloth that measures 5 feet long by 7 feet wide. the perimeter of the rectangular tablecloth is twice the length added to twice the width. how much trim does stan need to buy? (example 3) a. write an expression that represents the perimeter of the rectangular tablecloth. let l represent the length of the tablecloth and w represent its width. the expression would be . b. evaluate the expression p = 2w + 2l for l = 5 and w = 7. 2( ) + 2( ) = 14 + = stan bought of trim to sew onto the tablecloth.