I am having trouble with questions 4-6. Please lead me in the right direction. My grade depends on this and have searched for hours to understand...

4)   In M30, there is a clump of stars at a B-V of ~0-0.2, and V magnitude 15-16.  What post-main-sequenceevolutionary phase are these stars most likely to be?  (you may assume that these stars are <3 solar masses).

5)   What might be the cause of the scatter of points around the main sequence on the right side of both plots?

6)   Which cluster is older, and how do we know this?

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