Find the center and radius of the circle from the following equation. work needs to be provided x2 + 2x + y2 + 4y = 20

Which is an equation for the nth terms of the sequence 12,15,18,21

In the 30-60-90 triangle below side s has a length of and side r has a length

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.