How would you write 564,000,000 in scientific notation?

The first hexagon is dilated to form the second hexagon select the answers from the drop box menus to correctly complete the statement

Match each expression with its simplified form.

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?