What is the value of a in the equation 5a – 10b = 45, when b = 3?

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

What are “like terms”? why can we only add like terms?

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.