How did you get -16 from -9-5-20?

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

Drag the tiles to the boxes to form correct pairs. not all tiles will be used. match each set of vertices with the type of quadrilateral they form

The following division is being performed using multiplication by the reciprocal find the missing numbers is 5/12 divided by x/3 equals 5/12 times x/10 equals 1/x