The answers are:
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[B]: "√12 " ; AND:
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[D]: "√20" .
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Note: "Irrational numbers" have decimals that are: 1) non-terminating; AND: 2) non-repeating.
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Consider the answer choices given; and consider the given information that there "should be no more than one answer.
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Consider the following answer choices:
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Choice A) "√9" = 3 . Rule out this choice.
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Choice C) "√16" = 4 . Rule out this choice.
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Choice E) "√25" = 5. Rule out this choice.
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We are left with 2 (two) remaining answer choices:
[B]: "√12" ; and: [D]: "√20" .
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If there are more than one answer, then these two choices should be the correct answer. However, let us explore these two choices, using a calculator.
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[B]: "√12" = 3.4641016151377546
[D]: "√20" = 4.4721359549995794
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These two answer choices should the correct answers.