Which example shows simplifying variable expressions using associate property of addition? 2(3x - 6) = 6x - 12

4x + 9 + x + 6 = 5x + 15

(4x + 3) + 6x = (4x + 6x) + 3 = 10x + 3

- "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."

i will u if u answer my question in math

wow ok so the answer is 1k or just k

because of combining like terms xd