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A concave refracting surface is one with a center of curvature:
Operating Activities
The day-to-day actions of a business that relate to its core operations, including production, sales, and other functions that generate revenue.
Net Cash
Cash balance post the deducting of cash disbursements from cash receipts.
Investing Activities
Transactions involving the purchase or sale of long-term assets and other investments not included in cash equivalents.
Net Cash
Remaining cash after taking into account the cash received and spent.
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