Newbie: Cannot assign value of type (Double, Double, Double) to type Double

New to Swift and Xcode – working on my first app and have a function which carries out a number of calculations and outputs a Double – this works fine if I do a print(function).

 

When I then try and assign the output of the function to a variable, I get the error “Cannot assign value of type ‘(Double, Double, Double)’ to type ‘Double'”

 

I searched around, but can’t find anything useful.

 

Any suggestions much appreciated.

 

Thank you

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