Step-by-step explanation:

I think, he made a mistake because the exponents have different values but then if you'll look at his results, he just wrote the same thing. If you want, you could post the original problem, and I'll solve it for you :)
Answer:
part of it is cutted out show a better picture please ill answer it
Step-by-step explanation:

The appropriate choice is ...
... D) 1.0×10⁻³ inch