The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
five!!
4
3 of them.
One and it is 7
Two significant figures.
There are 5 significant figures in this number.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
None.None.None.None.
five!!
4
6 of them.
3 of them.
4 of them.
One and it is 7
This pair does not have the same or the same number of significant figures.
1.404 has four significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.