Question

0+(-13) equals to what?

Answer 1

♥ Your question:0+−13
Lets solve.
0+−13
=-13.
The reason for this is because when adding 0, it stays the same.
This is because 0 has no value, like people were to say 2+0=2 because 0 does not add on.
Hope this helps you understand it a bit more.

Answer 2

0 +(-13) = -13

Since this is addition, 0 plus the number is equal to the number.
Had it been multiplication, any number multiplied by 0 is 0.

It may not be visible but there is a 1 after the + sign.

0 + 1(-13) = - 13

When you multiply a number by 1 the product is the number. However, 1 and 13 have different signs, then the negative sign will prevail, thus -13 remains -13.