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b) (-2/4,0,3.1,√81)
are all of these numbers both rational and irrational?
No, not all of these numbers are both rational and irrational.
The number -2/4 is rational because it can be expressed as a fraction.
The number 0 is rational because it can be expressed as the fraction 0/1.
The number 3.1 is rational because it can be expressed as the fraction 31/10.
The number √81 is rational because it can be simplified to the integer 9, which can be expressed as the fraction 9/1.
Therefore, all of these numbers are rational.