Write 7B6A.
7B6Atwelve
in the base-ten system.

In base 12, A represents 10 and B represents 11. So

7B6A (base 12) = 7*12^3 + 11*12^2 + 6*12^1 + 10*12^0

7B6A (base 12) = 12,096 + 1,584 + 72 + 10

7B6A (base 12) = 13,762 (base 10)

it is probably the graph on the bottom right.

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."