What is the lower bound of 19.4 to 1 decimal place

Solve the equation - 2(m -30) = -6m a-15 b-13 c-8 d8

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.

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?