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determine whether the situation calls for a survey, an observational study, or an experiment.

you want to find out if prolonged exposure to the sun as a child affects skin cancer rates in adults.
question 4 options:

observational study

survey

experiment

Step-by-step explanation:

Research the cons and pros of the sun's powerful radiation waves.

I am joyous to assist you anytime.

- "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."