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Pls help me plsss

Collin did the work to see if 10 is a solution to the equation r/4=2.4

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42

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