29. Let \(f\) be the function given below. On which of the following intervals is \(f\) continuous?
$$ f(x) = \begin{cases} 3^x, & \text{if } x \leq -1 \\ \frac{2x + 3}{x + 4}, & \text{if } -1 < x \leq 0 \\ x^2 + 2x, & \text{if } 0 < x < 4 \\ \tan(x), & \text{if } x \geq 4 \end{cases} $$
