A sailor on ship A measures the angle between ship B and the pier and finds that it is 57°. A sailor on ship B measures the angle between ship A and the pier and finds that it is 39°. The measure of the angle between ships A and B is degrees.

George is 187 cm tall. his son, ralph, is 142 cm tall. who casts the longer shadow. george when the sun is 65° above the horizon, or ralph when the sun is 56° above the horizon? how much longer? (nearest centimeter)

Find the roots of the equation below. x^2 - 6 + 9 = 0

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.