Through three noncollinear points there exists exactly one line. a. always true b. sometimes true c. never true d. cannot be determined

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.