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The expression x² - 5 is prime.
Is it true or false

Ineed i been stuck on this question since yesterday

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex

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.