Explain the classification of number system

Which statement most accurately describe why the division property of exponents does not apply to the expression (-8)^2/(-3)^4

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.