When a point lie on the x-axis what do you know about its y coordinate? when a point lies on the y-axis, what do you know about it x-coordinate?

You have 6 dollars +12 pennies +to quarters + 4 dimes=2 nickels how much do you have

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?