What is the answer to 9 8/11 subtract from 2 13/20 when its a mixed number?

So, what we need to do here is:

2

first, we have to bring them to the same denominator: (multiply first fraction by 11, the second by 20)

2

now we can substract, let's do the fraction part first:

2=1

now the whole number:
1

The answer is  -7 and 17/220.
In subtracting mixed numbers, you just have to follow some easy steps.
1. First, you have to look for their LCD or the so-called Least Common Denominator from both's LCM or Least Common Multiple, so that both fraction part of the mixed number will have the same bottom number so that subtraction to both fractions is easier, like this:

20=20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 220
11=11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 121, 132, 143, 154, 165, 176, 187, 198, 209, 220

2. Proceed to subtraction, but do the fraction part first.

To see how it is done, open and see attached file below.

No a triangle cannot be formed because when you add the two smallest number together (which would be 11) the have to be bigger than the number it is "against" ( which would be 12)