Which of the following statements about planetary satellites is true?
a)all planetary satellites are relatively small, typically having a radius of no more than 20 kilometers.
b)all planetary satellites are as large as our moon or bigger.
c)planetary satellites vary greatly in size, but none are larger than any of the planets in the solar system.
d)planetary satellites vary greatly in size, from very small, to some that are larger than some planets.

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.