Please help with this question.

Step-by-step explanation:

Step-by-step explanation:

The two polygons are similar, so using the property of the similar figures:

Solving the fractions for the value of 'z' i.e the side of the big polygon:

On cross multiplication:

Dividing by '9' both the sides:

The value of 'z' is 10.

2

step-by-step explanation:

1+1=2

- "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."