Which group of organism has the shortest record of life on earth

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

Alonso walked with his friend andy one day, and wanted to compare their speeds. alonso walked 3 miles in one hour, and andy walked 2 miles in 2 hours. complete the table to graph the relationship for each person.

If the value of cos330°is√3/2 then find cos 165°.