Perimeter is 36. This is because the radius and side lengths are the same in a regular hexagon.
Are is roughly 93.53.
The reason fractions need a common denominator before adding or subtracting is so that the numbers of pieces you are adding/subtracting are all the same size. Note that the numerator of a fraction just tells you how many pieces you have of that size.
Step One: Calculate interest.

Step Two: Calculate the amount at the end of the first year.

Step Three: Calculate the amount at the end of the second year. This will be your final answer.
$1357 balance
I am not 100% positive.
10 teams play every other ( = 5) once
10 x 5 = 50 games total