18 = x - 9

What is X?

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

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian bought 4 bottles of water and 1 cup of coffee for his family for $7.15. how much does each bottle of water cost? how much does each cup of coffee cost? i need this done

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then