Adding to Variables Within a .FormulaR1C1 String

Each variable is a column that holds dates. I am trying to incorporate additional days onto the referenced date, as you can see with the "+15". It is giving me an error because I believe my syntax is off. What can I do to make it use Variable9 + 15 days, in the equation?

Thank you.

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Thanks Norie, the first solution solved my problem. (cant believe I missed that).

I have a follow up question: If I wanted the result when TRUE to be a seperate function (using a variable), how would I impliment that?

Here's my first thought:

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Variable9 is a column that only has dates. I changed the syntax to the following, in order for it to use the corresponding row. It is giving me a problem response of: 1/30/1900. Do I have to tell it that the variable is a date and that I am trying to add 30 days?

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I'm all set. The cell was blank, so it was adding 30 days to a blank cell. Thanks for your assitance.