For the functions below that have a removable discontinuity at $x = a$ [if the function does not have a removable discontinuity, type in "n" below], state the value of $g(a)$, where $g(x)$ agrees with $f(x)$ for $x \neq a$ and is continuous everywhere.

(a) $\displaystyle f(x)=\frac{x^2-2x-8}{x+2}$, $a=-2$

(b) $\displaystyle f(x)=\frac{x-7}{|x-7|}$, $a=7$

(c) $\displaystyle f(x)=\frac{x^3+64}{x+4}$, $a=-4$

(d) $\displaystyle f(x)=\frac{3-\sqrt{x}}{9-x}$, $a=9$

(a)
(b)
(c)
(d)