Number 1 is straight.
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Since the variable may be real or complex, there is no single word or phrase to describe such a thing.
The scientific definition of the word quantitative is to be able to describe or describe something as a quantity, the result of measuring something and relating to a number or quantity.
The most usual way to read such a number would be point one three nine, but you could also describe this as one hundred and thirty nine thousandths.
There is no single word to describe what happens. A two-word phrase is "arithmetic sequence".
The word sheep can be used to describe a single (sheep) and it can be used to describe several sheep.