Turn $4$ into a fraction greater than one with a denominator of $5$.

$4\left ( \frac{5}{5} \right )=\frac{20}{5}$

$\text{Add this to }\frac{4}{5}. \ \ \frac{20}{5}+\frac{4}{5}=\frac{24}{5}$

$\frac{24}{5}$

How many times does $7$ go into $17$? This will be the whole number portion of the mixed number.

Follow the steps outlined in part (a).

$3$ goes into $68$ twenty-two times, with a remainder of $2$.
How can you write this as a mixed number?