9) \( 9=\frac{r}{8} \)

To solve the equation \( 9 = \frac{r}{8} \), you can start by multiplying both sides by 8 to isolate \( r \). This gives you \( r = 9 \times 8 \), which simplifies to \( r = 72 \). So, the value of \( r \) is 72! When working with equations, it’s easy to overlook the steps that involve fractions. A common mistake is to forget to multiply across properly. Always double-check that you're accounting for each part of the equation before jumping to conclusions!