On a map of average annual temperature, why are the lower latitudes so much warmer than the higher latitudes?

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

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In an experiment, how can i change human errors? be specific.