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

Solve each problem by using a quadratic inequality.
Profitable fruitcakes. Sharon's revenue R (in dollars) on the sale of x fruitcakes is determined by the formula R = 50x - x^2. I COLLECTED 4 TIMES AS MUCH MONEY AS DERRICK. WE COLLECTED A TOTAL OF $3900 HOW MUCH DID EACH OF US COLLECT. THIS ONE REALLY PUTS ME IN A STUMP HOLE THANKS FOR ANY HELP. SINCERLY KEVIN