A surveyor needs to find the distance BC across a lake as part of a project to build a bridge. The distance from point A to point B is 325 feet. The measurement of angle A is 42° and the measurement of angle B is 110°. What is the distance BC across the lake to the nearest foot?

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.