a) subtracting 28, adding and subtracting are opposites b) multiply by 17. Multiplying and dividing are opposites
put the operation in order to explain you
To undo the operation of adding 28, you subtract 28, while to undo the operation of dividing by 17, you multiply by 17. This is because addition and subtraction, as well as multiplication and division, are inverse operations. Using the inverse allows you to return to the original number before the operation was applied.
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