A pebble fell from a bridge to the water below. The pebble entered the water at a speed of 19.6 m/s. How long did it take the pebble to reach the water from the bridge?

Consider circle h with a 3 centimeter radius. if the length of minor arc what is the measure of zrst?

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

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.