What is the greatest common factor of 45

The factors of 45 are 1, 3, 5, 9, 15, 45.

There is no greatest common factor since we are not comparing it to anything. However, if you want the greatest common factors of 45 and another number, you would just compare the two lists together and pick the highest number they have in common.

- "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."