The taxi cost $2.25 for the first mile plus $.15 cents for each additional tenth of a mile. for a 5.2-mile trip, eric paid $10 and told the driver to keep the change as a tip. how much was the drivers tip? ?
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The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

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.

You got a job selling magazines door-to-door. you are paid $100 per day plus $1.50 for each magazine you sell. which recursive formula models this situation?