Yes
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-4.2 is a negative decimal number. It is also a directed number.
0 is an even number
Any natural number and 0
The sum of any number and 0 is the original number.
The absolute value of a number is defined conceptually as its distance from 0. The absolute value of a complex number is therefore defined by the distance formula: |z| = sqrt(re(z)2 - im(z)2) 0 is a complex number, as is proven as follows: A complex number is a number of the form x + yi, where x and y are numbers. 0i = 0. 0 = 0 + 0. 0 = 0 + 0i. 0 = x + yi where x and y are 0. 0 is a number. Therefore, 0 is a complex number. As such, the distance formula can be used to calculate |0|: |0| = sqrt(re(0)2 - im(0)2) = sqrt(02 - 02) = sqrt(0 - 0) = sqrt(0) = 0