help me pls! with an explanation would be good

Answer:
[tex]\left\begin{array}{ccc}n&f(n)\\-5&5\\0&0\\5&5\\10&10\end{array}\right[/tex]
What does f(n) = |n| mean?
This equation is a function and it takes the absolute value of n. Absolute value is denoted by | |
What is absolute value?
Absolute value takes the positive value of the number within the brackets.
Example
|-7| = 7
|3| = 3
For each n value, take the absolute value of n
n = -5
|n| = |-5|
f(n) = 5
n = 0
|n| = |0|
f(n) = 0
n = 5
|n| = |5|
f(n) = 5
n = 10
|n| = |10|
f(n) = 10
[tex]\left\begin{array}{ccc}n&f(n)\\-5&5\\0&0\\5&5\\10&10\end{array}\right[/tex]