If f(x) is a function and f(1) = 5, then which of the following could not be true? a.)f(1) = 1 b.)f(2) = 1 c.)f(5) = 5

The choice a could not be true because the value of f(1) is already equal to 5. Therefore, the value of f(1) cannot be 1. This is one of the properties of a function that for every value of x, there should be only one corresponding value of y.

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