A graphing calculator is recommended.

For the function, consider the following.

$f(x)=\frac{15}{x(x+2)}$; find $f(3)$

$($a$)$ Evaluate the given expression.

$f(3)=$

$q,$

$($b$)$ Find the domain of the function. $($Enter your answer using interval notation.$)$

$$

$($c$)$ Find the range. $($Hint: Use a graphing calculator. You may have to ignore some false lines on the graph. Graphing in "dot mode" will also eliminate false lines. Enter your answer using interval notation.$)$

$$