Q: Is 51 a irrational

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yes, it is irrational. An irrational number can defined as a number that can not be expressed as a finite nor a repeating decimal.

It can be a rational number or an irrational number. For example, sqrt(2)*sqrt(50) = 10 is rational. sqrt(2)*sqrt(51) = sqrt(102) is irrational.

yes

Yes. The sum of two irrational numbers can be rational, or irrational.

It is always irrational.

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yes, it is irrational. An irrational number can defined as a number that can not be expressed as a finite nor a repeating decimal.

Sadly, it is not. It is the ratio of -51 to 1. That simple operation demonstrates that your number is quite rational.

The square root of 51 is an irrational number and it is about 7.14128429

Four examples of irrational numbers are 21/2, 31/2, 51/2 & 71/3

It can be a rational number or an irrational number. For example, sqrt(2)*sqrt(50) = 10 is rational. sqrt(2)*sqrt(51) = sqrt(102) is irrational.

First - 50 is a rational number, not an irrational number since it can be represented as a ratio of integers, i.e. 50/1 With that said: the two integers closest to it are 49 and 51

-4172 = -4172/1, 5.1= 51/10Both can be expressed as a ratio of two integers and so are rational.

Irrational. Irrational. Irrational. Irrational.

It is irrational.

Rational

Such a sum is always irrational.

If it says "negative irrational", then obviously it is irrational.