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Calculate the above formula, expressing the answer in scientific notation with the correct number of significant figures:

hint:
\[\Large 1 \times {10^{ - 3}} = 0.001\]

and:
\[\Large 3.61 \times {10^{ - 3}} = 0.00361\]

Do I need the full number or should I just shorten it to 2.454?

What exactly are the significant figures? I was confused on that part.

the significant figures are 2, 4, and 5

whereas, if we have this number: 1,200
then the significant figures are 1 and 2

if we have this number:
0.0025
then the significant figures are 2, and 5

your answer, is:
\[\Large 2.45 \times {10^3}\]

so, the number 2.454 x 10^-3 has four significant figures

please, wait,
is your computation an experimental measure?

I'm not sure what you mean on computation or experimental?

2.45 has three significant figures, whereas
2.454 has four significant figures

I'm confused on how I'm suppose to state my answer. How should I write it?

I have rounded off 2.454... to 2

more explanation:
a number like this one:
1.0
has two significant figures, namely 1 and 0

Do I have to round when stating my answer? Does it matter how I state my answer also?

yes! you have to round it, like below:
\[\Large 2.5 \times {10^3}\]

yes! the significant figures are 2 and 5, and the right result is 2.5 x 10^3

Thanks for all your help @Michele_Laino