Answer:
107 degrees
Explanation:
RPD and CPD are supplementary which means they add up to 180.
Step 1: Make an equation
5c + 57 + 6c + 13 = 180
Step 2: Combine like terms
5c + 57 + 6c + 13 = 180
11c + 70 = 180
Step 3: Subtract 70 from both sides
11c + 70 - 70 = 180 - 70
11c = 110
Step 4: Divide both sides by 11
11c / 11 = 110 / 11
c = 10
Step 5: Find RPD
5c + 57
5(10) + 57
50 + 57
107
Answer: 107 degrees