Which is the equation of a parabola with focus (0, 5) and directrix y= -1?

Why do interests rates on loans to be lower in a weak economy than in a strong one

Can someone me out here and the tell me the greatest common factor

The circumference of a redwood tree trunk is 20π ft, and it is 100 ft tall. what is the approximate volume of the redwood tree trunk? 1,000π ft3 10,000π ft3 4,000π ft3 40,000π ft3