How do you find the value of f when f(x) is defined as (5x + 1) / 2 and x equals 18?

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To find the value of f when x = 18 in the function f(x) = (5x + 1) / 2, we need to substitute 18 in for x in the equation.

Here are the steps to solve it:

  1. Start with the function: f(x) = (5x + 1) / 2
  2. Substitute x = 18: f(18) = (5(18) + 1) / 2
  3. Calculate 5(18): 5 * 18 = 90
  4. Add 1 to 90: 90 + 1 = 91
  5. Now, divide 91 by 2: 91 / 2 = 45.5

Therefore, when x = 18, the value of f(18) is 45.5.

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