What's the measure of each side length of a unit cube

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?

Look at the chart showing the results of a baseball player at bat. which is the probability of getting a hit?

The random variable x is defined as the number marking the sector in which the arrow lands when the spinner in the diagram is spun once.