Determining Limits 
The Question above states determine the limits, for problem a) I evaluated for when lim x->2 instead of 4. This was marked wrong im simply asking for a clarification on what the question is asking me to do. 

[2, 3, 6] might be the number of points given for each correct solution. In any case, it doesn't mean that you should calculate $\lim_{x\to 2}$ instead of $\lim_{x\to 4}$.
So what you should do for a) is
$$\lim_{x\to 4}\sqrt{4x+\sqrt x}=\sqrt{4\cdot 4+\sqrt 4}=\sqrt{18}=3\sqrt 2$$
The first answer is 2 points because you don't have any indeterminate form, just plug in $x=4$. The other answers value more points because there is more work involved to handle the indeterminate forms.
