Basic College Mathematics (10th Edition)

$\displaystyle 22\frac{1}{2}$ hours
We find out how many hours Mia studied in total by adding up her daily study hours: $\displaystyle 5\frac{1}{2}+6\frac{1}{4}+3\frac{3}{4}+7$ $=\displaystyle 5\frac{2}{4}+6\frac{1}{4}+3\frac{3}{4}+7$ $=\displaystyle 21\frac{6}{4}$ $=\displaystyle 21\frac{3}{2}$ $=\displaystyle 22\frac{1}{2}$ hours