Malcolm is so good at math that he can do most calculations in his head. it's very rare that he has to use a pencil and paper to answer a math problem. what should malcolm remember to do when taking math tests?

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

In angle pqr find the measure of

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.