Answer:
$780,000
Explanation:
In the balance sheet, the assets, liabilities, and stockholder equity is recorded. In this the accounting equation is used which is shown below: Â
Total assets = Total liabilities + stockholder equity
          =  $1,060,000 + $2,985,000
          = $4,045,000
And, the total assets would equal to
Total assets = Cash + Marketable securities +Accounts receivable + Inventory + Non-current assets, net
$4,045,000 = $3,265,000 + Marketable securities
So, the marketable securities would be
= $4,045,000 - $3,265,000
= $780,000