Answer:
Problem 1: Even
Problem 2: Even
Problem 3: Neither
Problem 4: Neither
Explanation:
You have to consider the fact that just because it is negative doesn't mean its odd. You have to do this, you take the function and plug –x in for x, and then simplify. If you end up with the exact same function that you started with (that is, if f (–x) = f (x), so all of the signs are the same), then the function is even.
Hope this helps! :)