State the number of significant figures.
1) 809 Answer : 3
2) 0.0060 Answer : 5?
3) 0.00000095 Answer : 9?
4) 5.60 Answer : 3
5) 5.743 Answer : 4
6) 0.010 Answer : 4?
1 answer
2, 3, 6 are wrong: Zeroes to the left of significant digits are NOT significant, unless they are between two non zero digits.