So, my textbook taught me in one of the steps add the exponents.
For example:
1.5 x 10^1 * 10^-7
1.5 x 10^-6
But, a problem of mine I have completed just got me confused because the answer I got isn't any of the answers available. It's a multiple choice. Here is my problem:
(2.5 x 10^-9) (1.5 x 10^3) = (2.5 * 1.5) (10^-9 * 10^3)
= 3.75 * 10^-6
= 3.75 x 10^1 * 10^-6
= 3.75 x 10^-5
Did I do something wrong? If so can someone explain this to me?

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why did you add a 10^1 in the 3rd line of your equations.

= 3.75 * 10^-6
(this is without what @tomo said, u don't need the extra 10^1 which you added)

Ya you can't introduce the extra 10^1... (unless you did it to both sides of the equality)

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