In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[Q]: Programming occurs in all _ subject areas in the discipline of computing.
[A]: nine


[Q]: Triaxial fabric is woven with _ sets of yarn whose intersections form equilateral triangles.
[A]: three


[Q]: Tobacco smoke contains up to _ percent carbon monoxide.
[A]:
four