Change subtraction operation to "adding the opposite."Then combine the numbers.   A)-13+12-(-1)

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lemjay | High School Teacher | (Level 3) Senior Educator

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`-13+12-(-1)`

First, remove the parenthesis by applying multiplication of like signs. This means that  `-(-1)` becomes +1.

`=-13+12+1`

And as per order of operation, to simplify start from the left. So, add -13 and 12. Note that when adding numbers with unlike signs, ignore  the signs of each number and subtract. The resulting value copies the sign of the larger number. 

`=-1 + 1`

Here, -1 is the opposite of 1. As per additive inverse property, the sum of the number and its opposite is zero.

`=0`

Hence,`-13+12-(-1)=0` .

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