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For your first question, read section 2.2 (uncertainties in the readings and measurements) in the attached notes.

here is the solution with explanation

here is the solution with explanation

here is the solution with explanation

You might find this one helpful.

The magnitude of upthrust acting on an object is equal to the weight of the fluid displaced by the object. The fluid may be liquid or gas. If it is air, then upthrust is very small, because the weight of the air displaced by the object is very small.