Step-by-step explanation:
Break down the expression:
1/3 of the sum of r + 8
The meaning of sum represents the end coefficient/number for adding numbers.
We'll have to add first, then multiply the equation by 1/3.
Our expression:
[tex](r + 8)[/tex]
[tex] \frac{1}{3}(r + 8)[/tex]
1/3(r + 8) is your answer.