Simplify 5^-2 x 5^5 x 5

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Prove the converse of the pythagorean theorem using similar triangles. the converse of the pythagorean theorem states that when the sum of the squares of the lengths of the legs of the triangle equals the squares length of the hypotenuse, the triangle is a right triangle. be sure to create and name the appropriate geometric figures.

The length of the line segment ac is 8x-9 what is the value of x