$3.$ Given $f(x)=x+4(a)(1$ point$)$ Find the domain $off(x)in$ interval notation. $(b)(2$ points$)$ Find $f\text{'}(2)(c)(3$ points$)$ Find the points $on$ the graph $off(x)$ where $f\text{'}(x)=0or$ undefined. $(d)(2$ points$)$ Find $f"(2)(d)(e)(3$ points$)$ Find the points $on$ the graph $off(x)$ where $f"(x)=0or$ undefined.

Given $f(x)=\frac{4}{x+4}.$

$(a)(1$ point$)$ Find the domain $off(x)in$ interval notation.

$(b)(2$ points$)$ Find $f^{\text{'}}(x)$

$(c)(3$ points$)$ Find the points $on$ the graph $off(x)$ where $f^{\text{'}}(x)=0or$ undefined.

$(d)(2$ points$)$ Find $f^{\text{'}\text{'}}(x)$

$(e)(3$ points$)$ Find the points $on$ the graph $off(x)$ where $f^{\text{'}\text{'}}(x)=0or$ undefined.