The sun is 150000000 kilometer from earth. write this number in scientific notation

Which value is not a solution of 8x^3 – 1 = 0

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.

Determine the area of a triangle with (see picture below)