Let $$f(x) = \begin{cases} x^{2}-2x & x \leq 6 \\ 4x & x>6 \end{cases}$$
(a) Is $f$ continuous at $x=6$ ? Yes No

(b) Is $f$ differentiable at $x=6$ ? Yes No

(c) If $f$ is differentiable at $x=6$ enter the value of $f'(6)$. If $f$ is NOT differentiable at $x=6$ enter the value of $f(6)$ instead.

$f'(6)$ or $f(6)$ =