How to write 4 is subtracted form five sixths of w in an algebraic expression

We must first determine the shape of a rectangular prisms _ a0 to find area of the prism

Hi my sisters and brothers can tell me the answer because i don’t understand the question

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?