A 30-foot ladder is leaning against an office building. If the base of the ladder is 12 feet away from the base of the building, find the angle of elevation. Round to
the nearest degree (whole number). REALLY NEED THIS FOR A TEST

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.

Solve for x and select the correct answer

Asequence has a common ratio of and f(5) = 81. which explicit formula represents the sequence? f(x) = 24 f(x) = 16 f(x) = 24 f(x) = 16