13/19 - (-1/19) -12/19 -14/19 14/19 12/19

13/19 - (-1/19)

2 negatives become positive

so

13/19 - (-1/19)
= 13/19  + 1/19
= 14/19

Answer
14/19

Hi!

Subtracting a negative number is the same as adding a positive number.

So we can write this as 

We don't have to do anything to the denominators, but we do have to add the numerators. 
13 + 1 = 14

The answer is 

Hope this helps! :)
-Peredhel

Answer: 900°

good luck on your studies! : )

david edward.