Question

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

Answer 1

Answer:

When the input is 4, the output of f(x) = x + 21 is 25.

Step-by-step explanation:

The given function is

$f(x)=x+21$

We need to find the output of the function if the input is 4. It meas we need to find the value of f(4).

Substitute x=4 in the given function.

$f(4)=(4)+21$

$f(4)=4+21$

After addition, we get

$f(4)=25$

When the input is 4, the output of f(x) = x + 21 is 25.

Therefore the required answer is 25.

Answer 2

$f(x)=x+21\Longrightarrow f(4)=4+21=\boxed{25}$