Question: Evaluation inputs with a single number

How do I do to get a single number (decimal) when I evaluate an input.

 

For example, I write this:

evalf((546, 1/1000000000)*(7, 0)*sqrt(36+1/(7, 0)^2));

but I still get the same thing as I inputed as a response, how do I do to get an actual number?

 

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