Final answer:
To solve the equation r/4 + 8 = 13, divide both sides by 4 and subtract 8. The solution is r = 20.
Step-by-step explanation:
To solve the equation r/4 + 8 = 13, we need to isolate the variable r.
First, we can subtract 8 from both sides of the equation to get r/4 = 5. Next, we can multiply both sides of the equation by 4 to get rid of the fraction, which gives us r = 20.
To verify our answer, we can substitute 20 into the original equation: 20/4 + 8 = 5 + 8 = 13.
Since the equation is true, our answer of r = 20 is correct.