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Assuming that the notation "666..." represents the number with infinitely many 6s, the number is rational.

Q: Is .786666666666... rational or irrational

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No. A rational plus an irrational is always an irrational.

rational

It is always irrational.

The product of a rational and irrational number can be rational if the rational is 0. Otherwise it is always irrational.

yes * * * * * No. Rational and irrational numbers are two DISJOINT subsets of the real numbers. That is, no rational number is irrational and no irrational is rational.

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4.6 is rational.

10.01 is a rational number

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is 34.54 and irrational or rational. number

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Rational.

No

If x is rational the it is rational. If x is irrational then it is irrational.

Rational. Rational. Rational. Rational.

rational

No. A rational plus an irrational is always an irrational.

They can be rational, irrational or complex numbers.They can be rational, irrational or complex numbers.They can be rational, irrational or complex numbers.They can be rational, irrational or complex numbers.