What effect does doubling the radius of a cylinder have on the volume of the cylinder?

Which value of c would make he following expression completely factored? 8x+cy

Madeline takes her family on a boat ride. going through york canal, she drives 6 miles in 10 minutes. later on as she crosses stover lake, she drives 30 minutes at the same average speed. which statement about the distances is true?

Using only odd number for numerators write two different subtraction problems that have a difference of 3/4