You added $\displaystyle-\frac{{5}}{{9}}\usepackage{cmbright}\Huge\$ and 1, but the question is asking for the value of $\displaystyle-\frac{{5}}{{9}}{\left({1}\right)}\usepackage{cmbright}\Huge\$ . Since the identity property of 1 states that $\displaystyle{x}{\left({1}\right)}={x}\usepackage{cmbright}\Huge\$ , then multiplying $\displaystyle-\frac{{5}}{{9}}\usepackage{cmbright}\Huge\$ by 1 does not change its value. The correct answer is $\displaystyle-\frac{{5}}{{9}}\usepackage{cmbright}\Huge\$ .