1. 
   2:

When you take the limit of a constant, like 3 or , as approaches any number (including 0 or 1), the result is always that constant itself! So for both of your first two limits, we have:

For the third limit, , you’re simply looking at the value of as it nears -3. Hence, the limit is:
3.

To sum it up, these limits demonstrate one of the simplest and most fun aspects of calculus: constants are as steady as a rock and don’t change, no matter where you look!