Can u guys please help me?

Question

this is the question

evaluate each expression using mental math. explain your method.

this is the problem

4+(-8)+19+(-7)

Answer 1

4+19 +(-8) + (-7)

23+(-15)

8

That how i do it, Idon't know if i am right i am only in eighth grade in pre-algebra

Answer 2

4+(-8)+19+(-7) = 4 - 8 + 19 - 7 = -4 + 12 = 8

Answer 3

rearranging gives 4+19 +(-8) + (-7)

23+(-15)

8

Answer 4

4-8=-4

-4+19 switch to 19-4 =15

15-7=8

adding a negative is the same as subtracting, and the order of addition can be switched.