Plz me! jan's age is 3 years less than tritt's age. the sum of their ages is 30. find their ages.

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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.

Define multiplicative inverse. give an example of a number and its multiplicative inverse.