The first one should be 8 since you want 0/0 here.

I would use the squeeze/turkey sandwich theorem here.

f is either the square or 0. Hence

as .

Third one... so for all x.

Here's I'm thinking of x as a natural number heading towards infinity, but I don't think it matters where we head.

Iin the last one we need

, which seems to be 15.

It's 2am and I'm done for tonight.

With a=2 we have

..............