E - 10 > 5 please help in class and get out of school at 3

Xis equal to three

Not sure what the question is but i hope this x = years100 * x

Use pythagorean’s theorem and find the missing side lengths of the two smaller triangles and add them together
13^2 - 12^2 = 5
15^2 - 12^2 = 9
5+9 = 14
14 is the length of each side of the square
14^2 + 14^2 = 19.8
19.8 is the diagonal length of the inside if the square