Which of the following could be rewritten as an addition problem of two integers with the same sign? a: -8 - 10 b: -8 + 10 c: 8 - 10 d: -8 - (-8)

A: -8 - 10

You can write  -8 - 10,as 
(-8) + (-10).
It will still the same because, "+" does not change sign, and we have two negative numbers that have sign "-" (-8 and - 10)