Justify your answer whether the following functions are conitinuous of not at a certain point or interval. Write your atswers on a separate sheet of peper.
11. \( f(x)=\frac{x^{2}+x-2}{x+2} \quad \) at \( x=-2 \)
12. \( f(x)=\frac{x}{x-1} \quad \) at \( x=1 \)
13. \( f(x)=x^{2}+7 x+6 \) on \( [-2,3] \)
14. \( f(x)=\frac{x^{\mathrm{I}}-2 x-1 \mathrm{~B}}{x-4} \) or \( [0,5] \)
15. \( f(x)=\sqrt{1-x^{2}} \) on \( [-1,1] \)
