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a)
$\lim_{x\rightarrow1}\left(3x-5\right)$
$3\left(1\right)-5=-2$
b)
$\lim_{x\rightarrow4}\ \frac{x+5}{3x}$
$\frac{9}{12}=\frac{3}{4}$
c)
$\lim_{x\rightarrow-2}\ \frac{x^2+2x}{x+2}$
$\frac{\left(x+2\right)x}{\left(x+2\right)1}=\frac{x}{1}=-2$