93000000 has 2 sig fig.
0.0310 has 3 significant figures.
93000000 is, itself a whole number so you would write it exactly as in the question.
Six
Seven
Four
2
Two. The zeros are just placeholders.
One
It is 93000000
231.57 has five significant figures/numbers. All the numbers in 231.57 are significant.
93,000,000 mile = 49,1000,000,000 feet
The figure 18.03 has a total of four significant numbers
Three. All nonzero numbers are significant, and any zeros in between significant numbers are significant.
Because 10.00400 is 10.004, this has five significant digits (numbers).
Two significant figures.
3 significant figures.
There are 5 significant figures.