This variable is undefined. check that the label is set correctly

[AS_10705494]

Hello, I am a ocean engineering student and a first time MathCAD user.

I am currently running MathCAD 7.0 Prime, kindly help me out.

Thanks, tips would be much appreciated.

[Fred_Kohlhepp]

You define a function, then try to use it as a variable.   

(Unless there's a good reason not to, it's best to post the sheet.  You'll get much better help!)

[ValeryOchkov]

Mathcad file please!