No because it can't be expessed as a fraction
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It is a rational number
Yes 4/10 or 2/5 is a rational number because it can be expressed as a fraction
Yes because the square root of 4 is 2 which is a rational number
3.25 is the ratio of 13 and 4, so it's rational.
0.75 is a rational number because it can be expressed as a decimal in the form of 3/4