If a point of a three-dimensional system is labeled with the coordinates (1, 2, -2) what is the Z coordinate?

a. 1
b. -1
c. 2
d. -2

This one I am not sure but I think it is d.

To determine the Z coordinate of a point with three-dimensional coordinates, you need to look at the third coordinate in the ordered triple. In this case, the third coordinate is -2. Therefore, the Z coordinate of the point (1, 2, -2) is -2.

So, the correct answer is indeed d. -2.