one sided limits

Find the limit of

 $\lim_{x\rightarrow-1^+}\left(\frac{x^2-1}{x^2+5x+4}\right)$  

• 0

• Undefined

•  $-\frac{2}{3}$  
  

• 10

What is  $\lim_{x\rightarrow0^-}\ f\left(x\right)$  ?

• -3

• The limit DOES NOT EXIST.

• -5

 $\lim_{x\rightarrow4^+}\left(\frac{6}{x-4}\right)$  

 $\lim_{x\rightarrow-2^-}\left(\frac{x+3}{x+2}\right)$  

 $\lim_{x\rightarrow4}\left(\frac{7}{x-4}\right)$  

 $\lim_{x\rightarrow-9^+}\left(\frac{x}{x+9}\right)$  

 $\lim_{x\rightarrow8}\frac{2}{\left(x-8\right)^2}$  

 $\lim_{x\rightarrow5^+}\frac{\left|x-5\right|}{x-5}$  

 $\lim_{x\rightarrow-10}\frac{\left|x+10\right|}{x+10}$  

• -7

• 0

• 1

• DNE