Question

What is the output of the function f(x) = x + 21 if the input is 4?

When the input is 4, the output of f(x) = x + 21.

Answer 1

Answer: output = 25

Work Shown:

Replace every x with 4. Use the order of operations PEMDAS to simplify

f(x) = x + 21

f(4) = 4 + 21

f(4) = 25

The input 4 leads to the output 25.