Question

Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar. 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 is ?

Answer 1

The output = 25

Explanation:

∵ f(x) = x + 21

∵ The input is 4 ⇒ x = 4

∴ the output is the value of f(4)

∴ f(4) = x + 21 = 25

∴ The output is 25