45 extra points a researcher posts a radio advertisement offering $35 in exchange for participation in a short study. the researcher accepts the first eight people who respond to the advertisement. which of the following statements is true about the sample?

its a short study is the answer

A or D.

Step-by-step explanation:

a. It is a valid sample because the first eight people were selected to participate.

b. It is not a valid sample because it is not a random sample of the population.

c. It is a valid sample because money was offered to participants.

d. It is not a valid sample because it is only a short study.

are these your choices?

if so, I would say A or D.

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step-by-step explanation:

sine over hypotenuse

cosine   equals adjacent

tangent over hypotenuse