Respuesta :

The given expression is

[tex]0.00045-2.5\times10^{-5}[/tex]

First, we express the first number in scientific notation. We have to make sure that both scientific notations have the same exponent.

[tex]45\times10^{-5}-2.5\times10^{-5}[/tex]

Then, we subtract the coefficients.

[tex](45-2.5)\times10^{-5}=42.5\times10^{-5}=4.25\times10^{-4}[/tex]

Therefore, the answer is

[tex]4.25\times10^{-4}[/tex]

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