It is 640.
72.8 round to two is 73.
2.6
22.1 to two significant figures = 22
425,000 written with two significant figures is 430,000.
They are all significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
0.036 The significant figures are indicated by the square brackets 0.0[35550], so we round this part of the figure.
72 is 72.2 rounded to two significant figures.
0.004560 to two significant figures results in: 0.0046
3800000
It is 640.
1.0
To round 48100231 Joules to two significant figures, you would round it to 48000000 Joules since the first two significant figures are 4 and 8. The trailing zeros are not significant.
76.51 rounded to 1 significant figures would be 77
72.8 round to two is 73.
2.6
93