Which expression represents 81 decreased by an unknown number? 81÷a 81a 81−a 81 + a

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Zlwaterfield asked Oct 18, 2022

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Which expression represents 81 decreased by an unknown number?

81÷a

81a

81−a

81 + a

Mathematics
college

Zlwaterfield asked Oct 18, 2022

by Zlwaterfield

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1 Answer

21 votes

Answer:

81 - a

Explanation:

Decreased

means to subtract

81 –

by an unknown number

means a variable such as a or x

therefor

81 – a

Nifriz answered Oct 23, 2022

by Nifriz

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