Out of 80 students in a class 30% are boys, find
the numbers of girls. Plz help me​

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.

Ineed with number 6 , explain how to get 1978

Aline that intersects one of two parallel lines intersects the other also always sometimes never