Question

select the irrational number? A)√9 B)√12 C)√16 D)√20 E)√25 (there should be more than one answer)

Answer 1

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.