6+2= need help asap plzz

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

How do i put 3(x+7) in distributive property

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.