Sadie computes the perimeter of a rectangle by adding the length, l , and width, w , and doubling this sum. eric computes the perimeter of a rectangle by doubling the length, l , doubling the width, w , and adding the doubled amounts. (a) write an expression for sadie's way of calculating perimeter. write a different expression for eric's way. (b) use both of the expressions to find the perimeter of a rectangle with length 30 and width 75.

a) P = 2(l+w)  Sadie

 P =2l+2w  Eric

b)  Sadie : P = 2(30+75) = 2(105) = 210

Eric: P = 2(30) +2(75) = 60+150 =210

I'm not entirely sure since we didn't learn this in class yet but I would say that Linear Pair Postulate goes with the ABC=135. Which leaves the subtraction Property of Equality for the last one. The reasoning I have for choosing that answer is becasue it made the made the most sense to me becasue the problem gives us the Linear Pair Postulate for BCD and I just thought that ABC = 135 was the other Linear Pair Postulate.