Simplify x raised ^ 5 x - 2

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top

How do i take any fraction and make it into a decimal or percentage?