What mistake did I make ?. Pleasee help me

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i

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.