[what does “3 pts req’rd to dwnl’d files” Mean?]
To answer this question will require some guessing again.
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As I cannot think of another supposed meaning of x than “the respective value found in the range” I suppose
=COUNTIF(B1:B6;">=0") should be the formula you are looking for. The role you tried to use x in, is implicit if I guessed right.
The ‘criterion concept’ has its flaws, however. =SUMPRODUCT(IF(B1:B6>=0;1;0)) will do it, too, and is more flexible. Since a comparison anyway returns a 1 if it came out true and a 0 (zero) otherwise,
=SUMPRODUCT(B1:B6>=0) is sufficient.