Answer: The GCF is 2
Step-by-step explanation:

First, express the mixed numbers as simple fractions:
1 3/5 = (1x5+3)/5 = 8/5
1 9/10= (10x1+9)/10 = 19/10
Add both:

The sum is greater than 3 and less than 4.
2-x/x/3=-2
what are you trying to figure out