Yes, -0.4 is a rational number. A rational number is any number that can be expressed as the quotient of two integers, where the denominator is not zero. In this case, -0.4 can be expressed as \(-\frac{4}{10}\), which simplifies to \(-\frac{2}{5}\). Since both -2 and 5 are integers, -0.4 is indeed a rational number.
is -0.4 a rational number
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