how do i calculate cash payments for operating activities?

LIQUIIILIES ULULAIVIUCIS LyURLY Cash Equipment Notes Payable Common Stock Retained Earnings a. 45,000 45,000 ? b. -2,000 -2,000 V Rent Expense V C. 5,000 5,000 V Fees Earned V d. -7,000 7,000 e. 20,000 20,000 f. -1,000 -1,000 Salaries Expense