book Maths Puzzle Numerical Ability

I have several of these problems to do. On all of them I have to find the horizontal and vertical asymptotes. The book is so unclear as to the steps you take-please help~
g(x)= 2x

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book Other Question

Bob has 3000 feet of fencing available to enclose a rectangular field.

a) express the area A of rectangle as a function of x where x is the length of rectangle.

b) For what value of x is the area largest?

c) What is the maximum area? Factoring Trinomials By Grouping

3n^3+12n^2-36n