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Give a geometric description of the set of points whose coordinates satisfy the given conditions.
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Valleys
Low areas or depressions between hills or mountains, often characterized by a river or stream running through them.
Demographic Questions
Questions used in surveys or studies that collect data about the characteristics of the population, such as age, gender, and income.
Survey Design
The planning of survey research, including methods for selecting participants and collecting data, to ensure reliable and valid results.
Self-Selected Sample
A self-selected sample is a group of individuals who have voluntarily chosen to participate in a survey or study, potentially leading to bias in the results.
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