## Faman39 2 years ago The world population in the year 2011 was approximately 7 x 10^9 people. If the population doubles in 100 years, how many people will be on the earth in the year 2111? Write your answer in scientific notation.

1. skullpatrol

Any ideas?

2. Faman39

Seriously not at all :(

3. skullpatrol

Do you know what the word "double" means?

4. Faman39

It could be 10 times 10, isnt it?

5. skullpatrol

No, it means " 2 times "

6. Faman39

i thought, i will have to make 10 exponent 10 ? so it is not 7 * 10 ^10

7. skullpatrol

No.

8. Faman39

So

9. Faman39

what is it and how?

10. skullpatrol

"If the population doubles in 100 years," means whatever the population is now; it will be 2 times that in 100 years from now.

11. Faman39

200

12. Faman39

?

13. skullpatrol

Not 2 times 100 years, but 2 times the population.

14. skullpatrol

|dw:1358429505360:dw|

15. Faman39

I got 140 after multiply

16. skullpatrol

17. Faman39

it is not my final answer

18. Faman39

i have to write this in scientific notation

19. Faman39

right?

20. skullpatrol

21. Faman39

1.4 * 10 ^10, isnt it?

22. Faman39

No

23. Faman39

tell me if i did something wrong with it

24. skullpatrol

You are correct.

25. Faman39

Thank you so much, it is just because of you. Thanks alot @skullpatrol ! :)

26. skullpatrol

np