Hello! Could you please help with these? It was due quite a long time ago. I have a D in this class and need to get my grades up.

16.

17.

18.

19.

Step-by-step explanation:

Equation is where k is a constant of proportionality.

16.

So, equation is

17.

Equation is

18.

Equation is

19.

Equation is

- "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."