999999999
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There can be only one.
3.5 billion is written as 3,500,000,000, so there are a total of 8 zeros. 1 billion will always have 9 zeros, so to write a number out digits you would just have to move the decimal point over 9 places. When you move the decimal 9 places to the right in 3.5 billion, you'll get your answer of 3,500,000,000 and you can simply count the zeros.
14
The decimal system has ten digits (0 through 9)
This is just decimal, the number system that we usually use. Decimal means that there are 10 digits (0-9) as opposed to other number systems such as binary, which has only two digits.