Rational numbers are those which can be written as one integer over another integer.
7.4329 = 74239/10000
74239 and 10000 are both integers, thus 7.4239 is a rational number.
No; 7.4239 is not an irrational number.
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No. The sum of an irrational number and any other [real] number is irrational.
A negative irrational number can be thought of as an irrational number multiplied by -1, or an irrational number with a minus sign in front of it.
If an irrational number is added to, (or multiplied by) a rational number, the result will always be an irrational number.
Any irrational number will, eg √2, π, e.
Yes