Use Limit Rules $($from section $1\mathrm{.}6)$ to discuss each limit$.$ State which rule$($s$)$ were used.

a$.\underset{h0}{lim}\frac{(h-2{)}^{3}8}{h}$

b$.\underset{v-3}{lim}\frac{2v^{2}5v-3}{v^4-81}$

$\underset{C.x-4}{lim}\frac{x4}{\sqrt[\phantom{2}]{x^{2}9}-5}$