In standard form what is (2 thousands 7 tens)÷10?

In standard form we have:

         2070÷10=207

The number in words is given by:

         (2 thousands 7 tens)÷10

Now, we know that:

2 thousands 7 tens is mathematically written as:  2070

( Because it means that 2 is written in thousand place,  7 is written in tens place)

Hence, we have to simplify the expression:

           2070÷10

( Now as we know both numerator and denominator have a common factor as: 10)

Hence, we cancel out 10 from numerator and denominator to get the result as follows:

                    2070÷10=207

- "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."