This is my first post, so I'm not sure if I'm doing it correctly... but I have various questions that I am having trouble answering, despite how elementary they probably seem.

1. The derivative of the square root of 3x+4. I do not know where to go after I do 1/2(3x+4)^1/2.. if that is even where I am supposed to go.

2. The derivative is (x+1)x^2 / (x-1)^1/2. I need to find when the continuous function f(x) is increasing, which means I have to set it equal to zero, I believe. When I do this, I keep getting that x = 0. But, therefore I can't solve the problem..?

3. The limit as it approaches positive infinity of f(x)= The square root of (x^2-14) / 3-2x.

Sorry, I could not figure out the answers to these problems.. well, actually, I could not figure out the answer to most of the problems assigned. These were just the ones I had no clue on.