The 7, 6, 2 and 8 are all significant.
The number 7268 is already in base 10, unless stated otherwise. This would make the answer of 7268 in base 10, 7268.
37.753 rounded to one significant figure becomes 40
6276 as a significant figure would be 4 significant figures.
1000 is written with one significant figure, with only the 1 being a significant figure.
It has 1 significant figure.
The first significant figure of 0.000169 is the 1 and it has 3 significant figures.
The significant figure 2.00 has to do with the certainty of a measurement.
654 rounded to one significant figure becomes 700.
The significant figure of 78.00100 is 78.00. It had 7 significant figures and a least significant decimal of -5.
There is one significant figure in 0.3.
4252 to 1 significant figure is 4000.
0.004 has 1 significant figure.