In order to determine speed, you must know a. time. c. both (a) and (b) b. distance. d. none of the above

Speed is
                 (distance covered) divided by (time to cover the distance).

So it must follow, as night follows day, that in order to determine speed,
you must know both the distance covered and the time to cover it.

A careful search of the convoluted and confusing list of choices given
with the question reveals that the correct choice is 

                  c).  Both (a) and (b) .  

There is no graph to look at on here, but i shall explain them to you. a line graph is just in its title it’s a graph with a line running through the dots to show an increase or decrease. a bar graph is used to show how much or how little something is so a comparison. a scatter plot is used to graph points to tell the data. and i don’t know what a histogram is.

The answer should be a.