Astained glass window in the form of an equilateral triangle is built on top of a rectangular window. the rectangular part of the window is one of clear glass and transmits twice as much light per square foot as the triangular part, which is made of stained glass. if the entire window has a perimeter of 20 ft, find the dimensions (to the nearest ft) of the window that will admit the most light.

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.