Adjusted basis would be calculated by starting with your original cost, then then adding things that increase your basis and subtracting things that would reduce your basis.
In the case of business assets, your cost would be what you paid for the asset, and reductions in basis would be depreciation that was deducted on your tax return that was associated with the assets.
Passive activity assets would be assets that are owned by a passive business that you have an ownership in, such as a partnership that is involved in real estate.
What schedule or form are you working with in TurboTax when you see these questions?
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