Voluntary sampling is one type of sampling method that is not probability based. this means that each member of a population is equally likely to be chosen for the survey. the results of the survey cannot reliably be extended and generalized. the likelihood of a member of the population volunteering to be surveyed is not probable. the results of the survey are not mathematically probable.

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Answercounterclockwise rotation about the origin by 180 degrees followed by reflection about the y-axisexplanationthe given figure has verticesrecall that for counterclockwise rotation about the origin, when we rotate figure pqrs counterclockwise through an angle of 180° about the origin, the coordinates will becomenext, we reflect in the y-axis by negating the x-coordinates of the resulting figure to obtain,therefore the correct answer is c