Answer
$-70^{\circ}$
Work Step by Step
First, ensure that your calculator is in radians.
On your graphing calculator, press the following sequence of buttons:
1. TAN$^{-1}$
2. (
3. -2.748
4. )
5. ENTER
Therefore, $arctan(-2.748)=tan^{-1}(-2.748)=-1.222$ radians. Then, convert this number to degrees by multiplying by $\frac{180}{\pi}$.
$-1.222radians=(-1.222(\frac{180}{\pi}))^{\circ}=-70^{\circ}$.
