A man cycles 20 km from A to B. If he increases his speed by 3 km/h, he saves 90 minutes on the journey. Find his original speed in km/h.​

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.

Find the value of x. give reasons to justify your solutions! c ∈ ae

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.