Help, I don’t know this problem

So, the answer is 13.

Step-by-step explanation:

(8r + 5) + (5r + 6) = 180  First collect the like terms

8r + 5r + 5 + 6 = 180

13r + 11 = 180

13r = 180 - 11

13r = 169  Now, divide both side by 13

r = 13

Let's check!

(8r + 5) + (5r + 6) = 180   Now, put 13 on the variables which is "r".

(8(13) + 5) + (5(13) + 6) = 180

(104 + 5) + (65 + 6) = 180

109 + 71 = 180

180 = 180

the answer is c

hope this !