3 times an unknown number is 21. Find the unknown number. The unknow number is

The answer is 7

Step-by-step explanation:

Because 7 times 3 will give you 21, just divide 21 by 3.

The answer is 7

Step-by-step explanation:

7+7+7=21

3×7=21

-1/2 +2

step-by-step explanation:

- "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."