Help I have problem with my code

Tell us what’s happening:

Your code so far

// Setup
var sum = 4;

function addThree() {

 return sum +sum;

// Only change code below this line7
function addFive(){
   sum +=5;
// Only change code above this line


Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36.

Challenge: Understanding Undefined Value returned from a Function

Link to the challenge:

Why did you change this function?

You should only be changing code where specified by the comments in the editor.

I don’t undersand can you explain me

That’s weird, the addThree() function should add 3 not double the number…
Did you change that function…?

You need to click Reset the Code and then only change code between the specified comments.

thanks you i resolve the problem