Question

Express your answer in scientific notation
`0.00045 - 2.5 * 10 {}^( - 5)`

Answer 1

The given expression is

`0.00045-2.5*10^(-5)`

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

`45*10^(-5)-2.5*10^(-5)`

Then, we subtract the coefficients.

`(45-2.5)*10^(-5)=42.5*10^(-5)=4.25*10^(-4)`

Therefore, the answer is

`4.25*10^(-4)`