PLEASE HELP ME WITH THIS

When turned about its axis of rotation, which shape could have created this three-dimensional object?

Nine more than four times a number is the same as one less than twice the number. find the number?

Mozart lenses inc. recently introduced seelites, a thinner lens for eyelasses. of a sample of 800 eyeglass wearers, 246 said they would purchases their next pair of eyeglasses with the new lenses. lenses inc. estimates that the number of people who purchase eyeglasses in a year is 1,700,000. most eyeglasses wearer buy one new pair of eyeglasses a year. what is the annual sales potential for the new lenses.