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

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To find f(4) given the function f(x) = 2x + 3, you need to substitute 4 for x in the function.

Start by plugging in the value:

f(4) = 2(4) + 3.

Now perform the multiplication first: 2 multiplied by 4 equals 8.

Next, add 3 to this result: 8 plus 3 equals 11.

Therefore, the value of f(4) is 11. This shows that when you input 4 into the function, the output is 11, which is the correct answer.