An elevator on the tenth floor goes down 9 floors. then it goes up 19 floors, down 3, and finally down 12. what floor does it end up on?

Ineed to know the answer to this algebra question.

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?

The polynomial 10x3 + 35x2 - 4x - 14 is factored by grouping. 10x3 + 35x2 - 4x - 14 5x )-20 what is the common factor that is missing from both sets of parentheses?