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True
perhapsAnother AnswerThis is not true. Every positive number is equal to its absolute value. Every negative number will be smaller than its absolute value.
A percentage error is 100*(measurement - true value)/true valueThe percentage error is negative if the measured (or calculated) value is smaller that the true value.
true
If an expression is true "for no value" of x, it means that there is no value you can substitute for x to make it true. For example, x=x+1 is true for no value of x, because x is always strictly less than x+1.