Both questions asked about the correctness of their solution to some problem (in these cases, recurrences). Despite one being slightly more "fleshed-out" than the other, neither seem well suited to the CS.SE site. This may be due to the fact that if the solution is correct a simple "yes" answer suffices. This results in no real discussion, as it is clearly not necessary. However, if the solution is incorrect, answers may nudge the OP in the correct direction.
Is there a way to massage these questions into a form more suitable for CS.SE? It not, what (online) avenues should be taken to check this work?
Personally, communication with classmates by the time I get home isn't the most effective. Hence asking on CS.SE.