Please Combine these 2 formulas, the work individually but not together.

=IF(C23="",(""),(K42))

=IF(C24&C23="",(K42))

what i am trying to get it to do is if c23 is blank or cells c23 and C24 are blank K42

Thanks

So you're basically saying if C23 is blank, then K42. C24 doesn't matter whether it's blank or not based on what you are saying, so the equation would be:
=IF(C23="",K42,"")

OR, based on your first equation, are you actually saying, IF C23 is NOT blank, OR, if C23 and C24 are blank, then K42. If this is the case, then one way of writing it would be:
=IF(AND(C23="",C24=""),K42,IF(C23<>"",K42,""))