HEL :is the expression 70-(4•15) a difference of three terms, a product of two terms, or a difference of two terms? Identify the terms in the expression

Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?