What does mechanical wave do with its energy

The multiplication property of zero states that the product of any number and 0 is 0. what must be true about either a or b to make ab=0

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.

Two florida panthers were weighed. one weighs 6x+21 pounds and the two together weigh 14x+11 pounds how much does he other panther weigh alone