السؤال 56

Select all true statements about 2 - 9 and 9 - 2.

2 - 9 equals -7.الإجابة الصحيحة
9 - 2 equals 7.الإجابة الصحيحة
The two results are equal.
Subtraction gives the same value whichever number is written first.
The two results are opposites of each other.الإجابة الصحيحة

الشرح

Starting at 2 and removing nine ends seven steps below zero, while starting at 9 and removing two ends seven steps above it, so the two lines land at matching distances on either side. Treating them as equal assumes subtraction can be reordered the way addition can, which would force both to finish above zero.

الشرح

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