Answer:
D. 3.3 x 10^24
Explanation:
In a number representing a measurement, the significant figure are those digits that have a meaningful contribution to specify the resolution of the measurement.
When a number is written in scientific notation, it is written as:
[tex]N=m \cdot 10^n[/tex]
where
m is the base
n is the exponent
When a number is written in this form, the number of significant figures is the number of digits contained in [tex]m[/tex].
In this problem, our number is initially written as
[tex]3.311\cdot 10^{24}[/tex]
We see that here "m" contains 4 digits, so here we have 4 significant figures.
In order to reduce it to 2 significant figures, we have to rewrite 3.311 as 3.3, therefore the new number will be:
[tex]3.3\cdot 10^{24}[/tex]
Which is option D.
