A political scientist wants to predict how the residents of New Jersey will react to a new bill
proposed in the state senate. Which of the following
study designs is most likely to provide reliable results
for the political scientist?

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.

- "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."

a.)the line for function b is steeper