Irrational number are

Numbers that never end and don't repeat either.  In definition, an irrational number is a number that cannot be written as a simple fraction.

Step-by-step explanation:

Examples of irrational numbers are:

*All square roots of natural numbers, except perfect squares, are irrational.:

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*Pi is an irrational number

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x^5/3y^1/3 the correct answer

hope it

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.