Let
$$f(x) = \frac{2 \cdot x}{2 \cdot x + 7}$$
Work out the domain of $f$. Then determine which of the following sets are contained in the domain of $f$.
(Remember that it is probably easier to do this if you draw all the sets on the number line.)
Choose all that apply – marks will be removed for choosing a wrong answer.
Choices:
$(-\frac{7}{2}, \infty)$
$(-10, -\frac{7}{2}]$
$(-\infty, -1)$
$(0, \infty)$
$\{-1\}$
$[-\frac{7}{2}, 1]$
