## Introductory Algebra for College Students (7th Edition)

$-1$
In adding two numbers with the same sign, perform the following steps: (1) Add their absolute values. $|-\frac{7}{10}| + |-\frac{3}{10}| = \frac{7}{10} + \frac{3}{10} = \frac{10}{10}=1$ (2) The sum must have sign common to the addends. $-\frac{7}{10}+(-\frac{3}{10}) = -1$ Thus, the sum is $-1$.