1. f(x)=6x
2. f(x)=3^x-2
3. f(x)=(1/2)^x
4. f(x)=log2x

well I'm not going to draw the graphs considering it will take a while for me to do it on the computer and I'm not too sure how to draw graphs on the computer too well. But anyway I can tell you an easy way of doing it. Make a table of values. So for the first one lets say you have:
x = 0 y = 0
x = 1 y = 6
x = 2 y = 12
x = 3 y = 18
x = -1 y = -6

and so on...

now you just plot these points. You do that with the rest of the functions. Very simple