No. If you can write the number on paper, it's rational.
68 is the ratio of 68 to 1.
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No. It's the ratio of -68 to 10.
An irrational number.
Since 68 is not a perfect square, its square root is irrational.
When added to a rational number, any irrational number will produce an irrational number.also, when added to an irrational number, any rational number will produce an irrational number.
It is not an irrational number!