## Selena2345 Group Title Heather wanted to measure the effects of erosion on a mound of soil in her backyard. The area she measured was 9 inches in height. During a storm it eroded 1/8 every day for 8 days. Write an expression that can be used to find the height of the mound of soil after the storm and simplify the expression. one year ago one year ago

1. electrokid Group Title

originally: 9in every day (1/8)th gets eroded.. how much is left out? -> 7/8th end of day 1-> $$h_1=9\times{7\over8}$$ end of day 2->$$h_2=h_1{7\over8}=9\times\left({7\over8}\right)^2$$ and so on.. end of nth day-> $$h_n=9\times\left({7\over8}\right)^n$$

2. electrokid Group Title

so how much would be left?

3. Selena2345 Group Title

63/8

4. Selena2345 Group Title

IS IT RIGHT electro kid

5. electrokid Group Title

it will be $$9\times\left({7\over8}\right)^8$$

6. Selena2345 Group Title

3.092480242

7. electrokid Group Title

yep

8. electrokid Group Title

how did you get 63/8?

9. Selena2345 Group Title

i multipled 9*7/8

10. electrokid Group Title

that is after the first day.. look at my elaboration.. after "n" number of days... $$h_n$$

11. electrokid Group Title

the question asks you to obtain that expression!

12. Selena2345 Group Title

CAN YOU HELP ME WITH 9 WORD PROBLEMS PLEASE ?

13. electrokid Group Title

say whaaaat!! i needed to chill, so i did this one.. there are lots o' nice people over here... post em up, I am sure somebody would answer

14. electrokid Group Title

:)

15. Selena2345 Group Title