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Change is usually the value of an expression before some operation subtracted from the value after the operation. Occasionally, subtraction may be replaced by division.
No. A value that is unknown may not be a variable but simply a constant whose value needs to be calculated.
The change in the input value is equalto the change in the output value.
A change in the coefficient, a change in the value of a variable.
% change = |original value - new value|/original value * 100%