Answer
$$\tan {115^ \circ } \approx - 2.1445$$
Work Step by Step
$$\eqalign{
& \tan {115^ \circ } \cr
& {\text{using a calculator to find the value }}\left( {{\text{set the calculator in degree mode}}} \right) \cr
& {\text{then}}{\text{, we obain}} \cr
& \tan {115^ \circ } \approx - 2.1445 \cr} $$