No. It can be written as 3/1.
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Any irrational number added to 0.5 will produce an irrational number.
1) Adding an irrational number and a rational number will always give you an irrational number. 2) Multiplying an irrational number by a non-zero rational number will always give you an irrational number.
Pi, is an irrational number (it cannot be written as a fraction) For this reason, 3 times pi is also irrational.
-3 is a rational number
No. The easiest counter-example to show that the product of two irrational numbers can be a rational number is that the product of √2 and √2 is 2. Likewise, the cube root of 2 is also an irrational number, but the product of 3√2, 3√2 and 3√2 is 2.