the question asks us to match each epression with its correct number of significant figures
so,
for 0.008, the number of significant figure is 1. which is 8 becase its the only significant nuber after the decimal place
For 1768, the number of signicant figures are 4, you have four whole numbers without a decimal
For 55 + 7, the number of significant figures are 2, for you to get this, you add up what is given. so 55 + 7 = 62, which is 2 significant figures
For 185, the number of signicant figures are 3, since you have three whole numbers without decimal.
so, in matching the expression with the correct number of significant figures:
0.008 1 Significant figure
1768 4
