Will a polynomial times a polynomial always equal a polynomial?

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that