Assuming that the last two digits are indicators of precision, there are 5 significant digits.
12 digits.12 digits.12 digits.12 digits.
Seven digits.
9 digits
There are 2892 digits.
All four of the digits given are significant digits.
There are 3 significant figures in 69.1
6, we count trailing zeros in sig figs.
6 digits
6
12 digits.12 digits.12 digits.12 digits.
A quadrillion has 16 digits.
Seven digits.
3 digits!
6 digits
4
11 digits
8 digits.