Answer: Lucia's cash flows from operating activities would be as follows:
$
Net income 135,200
Increase in accounts receivable (3,300)
Decrease in accounts payable (4,900)
Cash flows from operating activities 127,000
Explanation: In calculating cash flows from operating activities, all non-cash items like provisions, depreciation, gains / loss on disposals, etc are usually added back or deducted to / from the net income as the case may be, in order to adjust the net income from accrual accounting to cash basis. Literally, cash flows from operating activities are cash a business generates in the ordinary course of business. In this question, there is absence of non-cash items, only the movements in receivables and payable were presented.
Increase in accounts receivables means an outflow of cash; alternatively, decrease in accounts payable means settlement of obligations (cash outflows, as well). So, those would be deducted from the net income to arrive at cash flows from operating activities.