Whats the area of a square computer screen with 21-inch sides

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

Find the zeros of each function. f(x) = 6x^2 - 7x - 20