Incorrect. When you are adding numbers with different signs, you must first find the difference of their absolute values. Here it would be $\displaystyle{86}-{28}={58}\usepackage{cmbright}\Huge\$ . Then compare $\displaystyle{\left|{28}\right|}\usepackage{cmbright}\Huge\$ and $\displaystyle{\left|-{86}\right|}\usepackage{cmbright}\Huge\$ . Since $\displaystyle{86}>{28}\usepackage{cmbright}\Huge\$ , the negative addend ( $\displaystyle-{86}\usepackage{cmbright}\Huge\$ ) has a greater absolute value than the positive addend (28). So the sum is negative. The correct answer is $\displaystyle-{58}\usepackage{cmbright}\Huge\$ .