Can someone do all my algebra work for me...?

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.

Asphere has a diameter of 10 in. what is the volume of the sphere?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?