Find a common denominator.

By multiplying the first fraction by $\frac{3}{3}$ and the second fraction by $\frac{5}{5}$ you will achieve a common denominator of $15$.

Now, you should be able to add the numerators together to get the correct sum.

$\frac{9}{15}+\frac{5}{15}=\frac{14}{15}$

See part (a) for help.

See part (a) for help.