The correct answer is C. 3π.
When a rational number, such as √9 or 0.444..., is multiplied by 0.4, the result will always be rational. This is because multiplying a rational number by another rational number yields a rational number.
However, when π (pi) is multiplied by any nonzero rational number, such as 3, the result is always irrational. This is because π is an irrational number, and multiplying it by any nonzero rational number will not eliminate the irrationality of π. Thus, multiplying 3π by 0.4 will also give an irrational number.
Which number produces an irrational number when multiplied by 0.4?
A. √9
B. 0.444...
C. 3π
D. 217
3 answers
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