The question is down below.

12. [-/3 Points] DETAILS SPRECALC7 2.3.056. MY NOTES ASK YOUR TEACHER The graph shows the vertical acceleration of the ground from the 1994 Northridge earthquake in Los Angeles, as measured by a seismograph. (Here t represents the time in seconds.) (cm/s2)" 100 50 201 25 30 F (s) -50 (a) At what time t did the earthquake first make noticeable movements of the earth? sec (b) At what time t did the earthquake seem to end? sec (c) At what time t was the maximum intensity of the earthquake reached? sec Need Help? Read It