2. The solution set of the inequality $\frac { 2 - x } { x + 4 } > 0$ is $\_\_\_\_$.
(5 points) For plane vectors $\overrightarrow { a } , \overrightarrow { b }$, given $\overrightarrow { a } = ( 4,3 ) , 2 \overrightarrow { a } + \overrightarrow { b } = ( 3,18 )$, the cosine of the angle between $\overrightarrow { a }$ and $\overrightarrow { b }$ equals
2. The solution set of the inequality $\frac { 2 - x } { x + 4 } > 0$ is $\_\_\_\_$.