7. stock shares of champs sporting equipment opened at $12\frac{1}{8}$ and closed at the end of the day at…

Explanation:

Step1: Convert mixed - numbers to improper fractions

$12\frac{1}{8}=\frac{12\times8 + 1}{8}=\frac{97}{8}$ and $9\frac{1}{2}=\frac{9\times2+1}{2}=\frac{19}{2}$.

Step2: Find a common denominator

The common denominator of 8 and 2 is 8. So $\frac{19}{2}=\frac{19\times4}{2\times4}=\frac{76}{8}$.

Step3: Calculate the change

The change is the closing price minus the opening price. So $\frac{76}{8}-\frac{97}{8}=\frac{76 - 97}{8}=-\frac{21}{8}$.

Step4: Convert back to mixed - number

$-\frac{21}{8}=- 2\frac{5}{8}$.

Answer:

$-2\frac{5}{8}$