1) Substitution from definition.
2) We use
3) We are changing the order of 3 and .
4) We add 1 and 3 and we get
5) Substitution from definition (but the other way than at the beginning).
Which expression is equivalent to -4 - 9? A. 4 + 9 B. 4 - 9 C. -4 + (-9) D. -4 + 9
2 answers:
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