how many degrees are there in the angle made by the heart hand and the minute hand of a clock when it is 9 o'clock​

The table shows a pattern of exponents. what is the pattern as the exponents decrease?

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.