Add 13/15+(−4/15)

9/15

1/15

9/10

−1/15

The answer is 9/15.

To add the fractions 13/15 and -4/15, we need to have the same denominator. In this case, both fractions already have a denominator of 15.

Now, we can add the numerators:

13/15 + (-4/15) = 13 - 4 / 15 = 9/15.

So, the answer is 9/15.