Deanna has 80 books in her collection. if 60% of the books are fiction, how many are nonfiction

Me! i really need to get this right before 9. prove the divisibility of 7^6+7^5-7^4 by 11. use factoring so you get a number times 11. just tell me the number. i need this done asap

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14

How does reflecting or rotating a figure change the interior angles of the figure?