Question

which properties where used in [38 + 677] + (-38)

[677 + 38] + (-38)

677 + [38 + (-38)]

677 + 0

677

Answer 1

old question but will respond so this can be closed

starting with [38 + 677] + (-38), notice how
1. they swapped the order of addition between 677 and 38
2. they changed the brackets
3. they set 38 + (-38) equal to 0
4. they stated that 677 + 0 is equal to itself

there's a property for each of these steps. if you're not sure, please review

https://www.chilimath.com/lessons/introductory-algebra/basic-number-properties/