Question 23260
a) Yes. d=1500t
b) If t=0 , d=0 gives plotting point (0,0)
   If t=1 , d=1500 gives plotting point (1,1500)
The horizontal axis is the "t" axis; The vertical is the "d" axis.
c) Between those two points the change in d is 1500-0 = 1500
   the change in t is 1-0 = 1.  Slope = 1500/1= 1500
d)  In 3 seconds the wave travels 3(1500)meters = 4500 meters.
 Let the distance to the pod be x.  The round trip for the wave
is 2x.  Therefore 2x=4500 meters.  x = 2250 meters.
Distance to the pod is 2250 meters.

Cheers,
Stan H.