No, a positive and a positive make a positive
yes i.e -7 + 2 = -5
Its because that's what they came up with. Its just mathematically correct.
Yes, if you are adding 2 numbers together and the value of the negative number is larger than the value of the positive number.Yes, if you are multiplying a positive and a negative number...
When adding- yes When subtracting-noWhen multiplying-noWhen dividing-yes