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Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
No. For example take π and π-3 the difference of these 2 irrationals is 3.
To 4.5, add the difference between the two numbers (0.1), multiplied by some irrational number that is less than 1 (or divided by an irrational number greater than 1). For example:4.5 + 0.1 / pi
Yes. 2+sqrt(3) and 5+sqrt(3). Their difference is 3, which is rational.
Rational; 37/10 is a ratio, and it is the same number as 3.7