Question

Earthquakes release seismic waves that occur in concentric circles from the epicenter of the earthquake. Suppose a seismograph station determines the epicenter of an earthquake is located 9 kilometers from the station. If the epicenter is located at the origin, write the equation for the circular wave that passes through the station.
A. x2 + y2 = 81
B. x2 + y2 = 9
C. (x - 9)2 + (y - 9)2 = 0
D. (x + 9)2 + (y + 9)2 = 0

Answer 1

A

Answer 2

yay!