How do I show the correcting entry for...
Payment on account of $920 to a creditor was debited $290 to a/p and credited $290 to cash?

Also,

A $400 withdrawal of cash for Bett's personal use was debited $400 to salaries expense and credit $400 to cash

And finally

A customer was billed $170 for services provided. a/r was debited $170 and unearned service revenue was credited $175

1) Debit A/P for the difference between $920 and $290
Credit Cash for the same amount

2) Debit the Owners Drawing Account for $400Credit Salaries Expense for the same amount

3) Debit Unearned Service Revenue for $175
Credit Service Revenue for $170