B! Just graphed each answer on a calculator
Do you mean this number:

?
The we have to simplify the fraction part, since the nominator is bigger than the denominator.
How many denominators fit into the nominator? 20: 4=5
5! so

is simply 5 and we can add it to the main number:
175+5=180
2.947368421 when dividing you want to make sure te numbers are divisible <span />
Use Pythagoras:
x² = (8.5)² + (5)²
x = √[(8.5)² + (5)²]