From the calculation below, the actual difference, if Robert had read the numbers correctly, is 168.
Let X represents the number from which subtrahend is subtracted.
Therefore, we can calculate X as follows:
X – 17 = 222
X = 222 + 17 = 239
If the subtrahend is read correctly as 71 and then subtracted from 239, we have:
Actual difference = 239 – 71
Actual difference = 168
Learn more about subtrahend here: https://brainly.com/question/13073497.
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