Answer:
Explanation:
Investing activities are largely related to the acquisition of long term assets that are involved in the financial planning of a company's activities
The items of investing activities in the question are sales of land , purchase of equipment and office equipment . Please note that the gain on disposal of asset is not recognized because it is a  non cash income.
The other items belong to financing activities.
Sales of land - Â Â Â Â Â Â Â Â Â Â Â 45
Equipment acquisition     (18)
Office equipment         (40)
Net cash flow             (13)