Bye I quit yall can have my points

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Bob is putting books on a shelf and takes a break after filling 18 1/2 inches on the book shelf. the book shelf is now 2/3 full. how long is the entire bookshelf?

East black horse $0.25 total budget is $555 it'll cost $115 for other supplies about how many flyers do you think we can buy