Astore buys cds with $1 for each and sells them for 1.5 each how many cds should they sell to earn $100

Which expression is equivalent to the expression shown?

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?

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie