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How many possible seven digit phone numbers are there

Factor -8x3-2x2-12x-3 by grouping what is the resulting expression?

Triangle xyz has vertices x(1,3), y(0,0)

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected