it is any letter or mathematical symbol that represent a number or a set of number
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0. Any number multiplied by zero equals zero.
Is '1' Any number multiplied with its reciprocal is equal to '1'
Any rational number will do.
At least one of the factors has to be irrational.* An irrational number times ANY number (except zero) is irrational. * The product of two irrational numbers can be either rational or irrational.
No, any 2 negative numbers multiplied together equal a positive number