## mitosuki Group Title Please help! A ball is dropped from the top of a 1,000 foot building. The height of the ball is half its original height after each bounce. What will the height of the ball be after 12 bounces? Using complete sentences, explain the procedure taken to answer this question. 2 years ago 2 years ago

1. mitosuki Group Title

You dont have explain in sentences. I just want the height please!

2. moneybird Group Title

This is geometric sequence

3. mitosuki Group Title

Yes it is, I get the answer 0.48828125, But i dont think it is right.

4. moneybird Group Title

a = 1000 r = 1/2 n = 12 $1000 (\frac{1}{2})^{n-1}$

5. moneybird Group Title

It should be n not n-1

6. mitosuki Group Title

Ok I did that and get 0.488281125

7. moneybird Group Title

$1000 (\frac{1}{2})^{12}$

8. mitosuki Group Title

But why not n-1?

9. mitosuki Group Title

Because the formula I am given is with n-1, hmm idkk

10. moneybird Group Title

Do you mean the geometric formula that you are given or this question provides you a formula?

11. mitosuki Group Title

Well that's the only formula I am given in my lesson.. yeah the first part of ur question is right

12. moneybird Group Title

It shouldn't be n-1. You need to visualize the situation

13. mitosuki Group Title

Ok, then why don't you use -1? Because the first height wouldn't count right?

14. moneybird Group Title

|dw:1323133998962:dw|

15. mitosuki Group Title

thanks, i kinda understand now.

16. moneybird Group Title

Glad that you get help from Open Study

17. mitosuki Group Title

Thank you :)