Sketch the following sets on a piece of paper and write them in interval notation. Enter the interval in the answer box. You may use "infinity" for $\infty$ and "-infinity" for $-\infty$. For example, you may write (-infinity, 5] for the interval $(-\infty,5]$.
$x\geq 7$ 
$x\leq 6$ 
$x > 24$ 
$x<18$