The difference between numbers is calculated by subtracting them.
The difference is: [tex]\mathbf{(b)\ 3.218 \times 10^{-4}}[/tex]
Let the numbers be x and y
So, we have:
[tex]\mathbf{x = 7.63 \times 10^{-5}}[/tex]
[tex]\mathbf{y = 3.981 \times 10^{-4}}[/tex]
The difference is calculated as follows:
[tex]\mathbf{y - x = 3.981 \times 10^{-4} - 7.63 \times 10^{-5}}[/tex]
Factor out 1/10
[tex]\mathbf{y - x = 3.981 \times 10^{-4} - 7.63 \times 10^{-4} \times 10^{-1}}[/tex]
Factor out 10^-4
[tex]\mathbf{y - x = 10^{-4} \times ( 3.981 - 7.63 \times 10^{-1})}[/tex]
[tex]\mathbf{y - x = 10^{-4} \times ( 3.981 - 0.763)}[/tex]
Subtract
[tex]\mathbf{y - x = 10^{-4} \times ( 3.218)}[/tex]
Evaluate the product
[tex]\mathbf{y - x = 3.218 \times 10^{-4}}[/tex]
Hence, the difference is: [tex]\mathbf{(b)\ 3.218 \times 10^{-4}}[/tex]
Read more about subtractions at
https://brainly.com/question/17781221
