Ugh math is so annoying but hoping you will help

Write the equation in logarithmic form 8^x=64

Find two consexutive odd integers such that the sum of their square is 650

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.