Please kindly explain the formulas

Additional Information for Lincoln Corp: 1) Operating expenses for 20X4 included depreciation for $500 2) Accounts payable relate exclusively to the purchase of inventory 3) Machine with a historical cost of $200 was sold at a loss of $20 4) A new machine was purchased during the year for $1,200 5) Dividends were declared 6) Long term notes payable were issued The total "Net Cash provided (used) by Investing Activities" when using the direct method was