Question

Can someone explain the properties and help me with this work?

Answer 1

The first property is commutative ( the numbers 38 and 677 are swapped over)



Then we have the associative property ( where the paretheses are moved to get 38 and -38 together)

then the additive inverse ( 38 + (-38) = 0

and finally to get the 677 we use the additive identity property.