3 significants
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10 significant figures.
The greater the number of significant figures, the greater the precision. Each significant figure increases the precision by a factor of ten. For example pi = 3.14 is accurate to 3 significant figures, while pi = 3.14159 with 6 significant figures is a more accurate representation.
Six of them.
48.921 has five significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
one