To perform the required calculation, we need to transform the first term into a scientific notation, or the second one in normal number, then we perform the calculation.
Transforming the first one into scientific notation, we have the following:
[tex]0.00045=4.5*10^{-4}=45*10^{-5}[/tex]
To solve the present problem, we will use the same order for the number 10. This will allow us to make the following:
[tex]\begin{gathered} 45*10^{-5}-2.5*10^{-5}=\left(45-2.5\right?*10^{-5} \\ =42.5*10^{-5} \end{gathered}[/tex]
now, we need to transform it in such a way that the number is between 1 and 10, as follows:
[tex]42.5*10^{-5}=4.25*10^{-4}[/tex]
From the solution developed above, we are able to conclude that the answer to the proposed problem is:
[tex]4.25*10^{-4}[/tex]
