SOLUTION: How would you express 0.000409 in scientific notation?

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The first rule for scientific notation is that the number (significant figure) has to be between 1 and 10
So, your first number must be
Then, you add the traditional
Then count how many spaces to the right you moved the decimal. (4)
Since you moved it to the right, your exponent after the 10 will be negative 4
So, your answer in scientific notation is
Hope this helps!