no, the absolute value does not change the subtraction into addition. it does however, change the difference to positive ( if the difference is negative)
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Absolute value of the difference? 5 Subtraction? -5 Addition? 1
The answer depends on the operation. The absolute value of 2/3 is not the same as the absolute value of 3/2! It does work for subtraction, though.
It depends on the operation and values of the positive and negative. For example, in multiplication or division a positive and negative will be a negative. In addition or subtraction, it depends on the absolute value of the original numbers.
Absolute pressure is simply the addition of the observed gage pressure plus the value of the local atmospheric pressure.
300. Numbers only change when put in absolute value if they are negative. The absolute value just takes the positive number of all positive and negative numbers.