Why is it possible to have right equilateral triangles

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

Which table shows a proportional relationship between miles traveled and gas used?

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?