You have 40 different books: 20 math books, 15 history books, and 5 geography books. in how many different ways can you put the 40 books in a row on a shelf?

Find the zero function by factoring (try to show work) h(x)=-x^2-6x-9

Yo need asap pls ! markin da brainiest too !

(10. in the figure, a aabc is drawn tocircumscribe a circle of radius 3 cm ,such thatthe segments bd and dc are respectively oflength 6 cm and 9 cm. find the length ofsides ab and ac.