To determine f(3), we first need to know the function f(x). If we have an explicit formula for f(x), we can then simply substitute 3 in for x to find f(3). For example, if f(x) = 2x + 1, we would calculate:
f(3) = 2(3) + 1 = 6 + 1 = 7.
If the function is not explicitly given, we may need additional information like a table of values, a graph, or a description of the function to find f(3). Without that information, we cannot determine the value of f(3). Please provide the function or more details for a more specific answer.