Rectangle with length ( x + 3 ) and width 7
P = 2l + 2wP = 2(x + 3) + 2(7)P = 2(x) + 2(3) + 14P = 2x + 6 + 14P = 2x + 20A = lwA= 7(x + 3)A = 7(x) + 7(3)A = 7x + 21
