Your screenshot actually shows the issue, the brackets highlighted in red belong to the MULT function. Notice that it ends before that last INDEX function.

As a result, you're MULT ends with ,10 and doesn't include anything after that point so you have stray content causing syntax errors.

Since your Multiplying, you don't need to group individual pieces at all.

1. Remove 1 of the left brackets between MULT and INDEX
2. Remove both right brackets immediately after 10
3. Remove the left bracket before the second INDEX
4. Add 1 right bracket at the end

Just to save yourself trouble in the future, you don't want to start throwing brackets around because it will just cause more headaches.

Instead, build your calculations one piece/function at a time. For example, don't throw a bunch of indexes right into a MULT. Test an INDEX to make sure it gets you the value you want, then if so put it aside.

Then, build your MULT function with just placeholder values to test it out. If it works, copy and paste your INDEX functions in to replace the placeholders instead of having to try and count brackets and digging yourself in deeper.

I think I translated this correctly.  Now instead of syntax error, I'm getting incorrect number of input parameters error.  ?  I wish there was a CPP course on this!