What is a raised number that represents repeated multiplication of a factor?

Which of the following represents the length of a diagonal of this trapezoid?

What are the solutions of the equation x4 – 5x2 – 14 = 0? use factoring to solve. someone !

Aconstruction worker needs to put a rectangular window in the side of a building he knows from measuring that the top and bottom of the window have a width of 8bfeet and the sides have a length of 15 feet he also measured one diagonal to be 17 feet what is the length of the other diagonal