It is a mapping which assigns one or more outputs to each set of one or more inputs. A relationship need not be a function.
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The relationship is called a surjection or a surjective function.
~the function is most likely inversely proportional. ~more input results in less output.
Without knowing the specific function or equation being used, it is impossible to determine the output value if the input value is 4. In mathematics, the output value is dependent on the specific function or equation being evaluated. To find the output value when the input value is 4, you would need to know the function or equation being used and then substitute 4 in place of the input variable to calculate the output value.
No. A function has only one output per input.
the output is halved