Which expression is equivalent to (0.21t - 0.3) – (0.8t – 0.21)? Choose the correct answer below.
OA. 0.591 + 0.51
OB. -0.591 +0.51
OC. 0.591 -0.09
OD. - 0.59-0.09

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.

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?