## Algebra: A Combined Approach (4th Edition)

$\frac{3}{20}$
$-\frac{1}{4}-(-\frac{2}{5})=-\frac{5}{20}+\frac{8}{20}=\frac{3}{20}$ First, find a least common denominator. In this instance it is 20, then follow the operators. Subtracting two negative terms leads to their absolute values to be subtracted, and the sign of the largest absolute value to be the one of the answer.