This problem is about deductive reasoning.
The given statements are
• If you are on the basketball team, then you have practice on Thursday.
,
• You have practice on Thursday.
You can see these problems as consequences from a specific event. For example, the first statement is saying that "if" you are on the team, then you have practice on Thursday, this means that if you are not on the team, then you don't have practice on Thursday.
So, in the second statement is actually saying that you will have practice on Thursday, the question would be What does this mean?
Well, according to the first statement, if you have practice on Thursday that means you are on the basketball team.