Answer:
Purchase of treasury stock
Explanation:
sale of equipment: is related to investing because the purchases of equipment is considered investing
purchases of stock in another company: is also investing, because is the use of cash in activities which aren't the main activity.
interest revenue/expense: In the cash flow statment we need to recognize Interest paid or received. That's because the recognition of interest may differ with the payment.
purchase of treasury stock: This is cash used todo purchase own shares, we are using cash for financing purposes, because shares transactions are placed in financing activities.
