## newwar one year ago Miranda is adding the numbers below. What is the sum written in scientific notation? A. B. C. D.

1. newwar

2. newwar

@AmyRoseRules

3. newwar

@pooja195

4. dm91

what grade are you in because i can try to help you but you have to help me out as well

5. newwar

8th

6. dm91

ok i might know you i am in 8th as well my name is Mary

7. newwar

my name is james do u do k12

8. dm91

yes

9. newwar

ok cool

10. dm91

k so you would do 2.9*10=29

11. newwar

29

12. dm91

then you would do 5,35*10=53.5

13. dm91

ok now the fun part

14. dm91

ok james are you understanding what i am doing?

15. newwar

yes

16. dm91

ok i did it wrong to a point. If you add 2.9+5.35 what would you get?

17. newwar

8.25

18. dm91

ok that is right

19. newwar

ok so what do i do next

20. dm91

ok so what would you say you would do next?

21. dm91

22. newwar

ok thank u

23. anonymous

think of the $$10^{10}$$ as, say, a variable thus $$\bf 2.9\times 10^{10}+5.35\times 10^{10}\qquad say\quad 10^{10}=a \\ \quad \\ 2.95a+5.35a\cdot (2.95+5.35)a\implies (8.25)a\implies 8.25\times 10^{10}$$

24. dm91

ya you can think of it that way as well

25. newwar

lol