If f(x) = 2x + 3, what is f(4)?

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Evaluating a function means plugging the given input into the expression. For f(x) = 2x + 3, replace x with 4: f(4) = 2(4) + 3 = 8 + 3 = 11. So the output when x is 4 is 11. The other numbers don’t come from using x = 4 in this rule.