1. 8 + 7k - 2
what is the answer to this

-0.2+7k

Step-by-step explanation:

Rearrange the equation so that it is 1.8-2+7k

1.8-2=-0.2

You can't add 7k because it doesn't have a common variable

-0.2+7k

the correct answer is 828.07

- "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."