Consider the function $f(x) = \frac { 2 x + 7 } { 3 x + 3 }$. For this function there are two important intervals: $(-\infty, A)$ and $(A,\infty)$ where the function is not defined at $A$.
Find $A$
For each of the following intervals, tell whether $f(x)$ is increasing (type in INC) or decreasing (type in DEC).
$(-\infty, A)$:
$(A,\infty)$
Note that this function has no inflection points, but we can still consider its concavity. For each of the following intervals, tell whether $f(x)$ is concave up (type in CU) or concave down (type in CD).
$(-\infty, A)$:
$(A,\infty)$

You can earn partial credit on this problem.