I have to make a true statement with this question:

Question

{All states west of the Rocky Mountains}

{All states west of the
Atlantic Ocean}

I have to determine if the two statements are:

Proper Subset
is a subset of
is not a subset of
proper subset and is a subset of

PsyDAG · Answer

Since this is not my area of expertise, I searched Google under the key words "proper subsets" to get this:

http://en.wikipedia.org/wiki/Subset
http://mathworld.wolfram.com/ProperSubset.html

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.