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This includes the $80,000 paid for dividends to shareholders. Dividends paid is a financing activity, not an investing activity.
This is the cash received from the sale of available-for-sale securities. The sale of securities was not the only investing activity that took place.
This is the cash paid for the acquisition of land. The acquisition of land was not the only investing activity that took place.
$2,800,000 cash received from the sale of available-for-sale securities is a cash inflow and cash paid for the acquisition of land is a cash outflow ($1,500,000). Both are investing activities. The net cash flow from investing activities is $2,800,000 - $1,500,000 = $1,300,000.