First, let's compare the two numbers: -8 1/5 and -8 3/4.
To do this, we can convert both fractions to decimals.
-8 1/5 can be converted as follows: -8 + 1/5 = -8 + 0.2 = -7.8
-8 3/4 can be converted as follows: -8 + 3/4 = -8 + 0.75 = -7.25
Now we compare -7.8 and -7.25: -7.8 < -7.25
So the correct sign is: B. <
Now, let's put the numbers in order from least to greatest: -13.5, 0.9, 4/5, 7/35, 13.
First, we change all numbers to decimals:
-13.5 remains -13.5. 4/5 = 0.8. 0.9 remains 0.9. 7/35 = 0.2 (since 7 ÷ 35 = 0.2). 13 remains 13.
Now we can order them: -13.5, 0.2 (which is 7/35), 0.8 (which is 4/5), 0.9, and 13.
So the ordered list from least to greatest is: -13.5, 7/35, 4/5, 0.9, 13.