Need with these two math questions

What is the vertical asymptotes of the function f(x)=x-2/x*2-3x-4

Farnesene is a sesquiterpene. how many different isomers arising from double-bond isomerizations are possible? g

The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?