## narissa one year ago help

1. narissa

2. anonymous

What do you think it is?

3. narissa

is it d?

4. anonymous

No, do you want me to guide you through it or do you want to try one more time?

5. calculusxy

$\large (2.5 \times 9)(10^{-8} \times 10^{-9})$ However, remember that the bases (in scientific notation) needs to be between 1 and 10.

6. anonymous

^

7. narissa

explain

8. calculusxy

Your product is really 22.5 (which is not between 1 and 10) so you need to move the decimal place to the left to make it 2.25 (which is between 1 and 10).

9. calculusxy

When you do that, you need to do an extra step

10. narissa

wow confusing

11. anonymous

When you multiply 2.5 and 9, you get 22.5, which is not in scientific notation, so you must change it back

12. calculusxy

$\huge 2.25 \times 10^1 \times 10^{-18}$

13. narissa

so a

14. calculusxy

$\huge 10^1$ is needed because you moved the decimal one place to the left. Now the reverse can be applied to when you need to move the decimal place to the left. $\huge 10^{-1}$

15. anonymous

No, it will still be negative

16. calculusxy

Not really what is $\large 1 + {-18}$

17. calculusxy

18. narissa

-17

19. calculusxy

20. narissa

thanks both of u

21. narissa

c

22. anonymous

Yes

23. calculusxy

Correct!