-4/12 equals -1/3, which has the pattern of 3's after the decimal point repeat infinitely. That is how -4/12 is a rational number.
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The rational number -4 can be expressed as -4/1 or -8/2 or -12/3, and so on.
Rational.
Yes. It's the ratio of -144 and 4. That makes it a rational number by definition.
.4/.8 is the same as 1/2 which is a rational number
Yes.