8c+5c+21 can anyone solve that.

Add like terms

one way to understand adding like terms is the distributive propery

a (b+c) = ab+ac so

8c+5c = (8+5) c

then add 8+5=13

(13) c

13c so

13c+21

we can't add them together since the 21 doesn't have a placeholder with it

the answer is 13c+21

13c + 21 I'm pretty sure it stays like that because of the variable C.