No. All integers are rational.
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Its square root an irrational number and it is about 9.3 rounded to one decimal place
The square root of 86 is approximately 9.2736. To find this, you can first estimate the square root of 86 to be between 9 and 10. Then, using a method like the Babylonian method, you can iteratively refine your estimate until you reach a desired level of accuracy.
yes
Yes. The sum of two irrational numbers can be rational, or irrational.
It is always irrational.