Answer
$\dfrac{137}{180}$
Work Step by Step
To add two fractions, make sure that the denominators are the same. If they are not, then find their least common denominator.
In this exercise, the least common denominator is $180$. Rewrite the fractions so that they have common denominators:
$\dfrac{11(15)}{12(15)} - \dfrac{7(4)}{45(4)}$
$=\dfrac{165}{180} - \dfrac{28}{180}$
Subtract the numerators, keeping the denominator as-is:
$=\dfrac{137}{180}$
