Your phone bill has a charge of $29.95 and an extra $0.10 per minute for the n minutes you went over your plan. Write an expression for the cost of your phone bill if you exceed your plan by n minutes.

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?

If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. which set of triangles shows the similar triangles created by the altitude in the diagram?

Which geometric principle is used to justify the construction below?