If each quadrilateral is a rectangle, find the missing measures

Step 1. When there is a in front of an expression in parentheses, change the sign of each term in the expression-> -11 + 5 - 9 - (-13) - (-5)
Step 2. When there is a in front of an expression in parentheses, change the sign of each term in the expression-> -11 + 5 - 9 + 13 - (-5)
Step 3. When there is a in front of an expression in parentheses, change the sign of each term in the expression -> -11 + 5 - 9 + 13 + 5
Step 4. Calculate the sum or difference
The ANSWER is 3 .