## anonymous one year ago A skier has decided that on each trip down a slope, she will do 2 more jumps than before. On her first trip she did 6 jumps. Derive the sigma notation that shows how many total jumps she attempts from her fourth trip down the hill through her twelfth trip. Then solve for how many total jumps she attempts from her fourth trip down the hill through her twelfth trip.

1. anonymous

$\sum_{i=4}^{12}2i+4 ; 180 jumps$

2. anonymous

$\sum_{i=2}^{10}2i+4 ;144 jumps$

3. anonymous

$\sum_{i=2}^{10}4i+2 ; 234 jumps$

4. anonymous

$\sum_{i=2}^{10}4i+2 : 30$

5. anonymous

I meant 306 jumps for the last one:)

6. anonymous

@jim_thompson5910

7. anonymous

I think that it's either A or B

8. jim_thompson5910

9. anonymous

It says, "she does it 2 more times to I assumed 2x" at least anyways :)

10. jim_thompson5910

that's correct. The 2i indicates that the number of jumps is increasing by 2 each time

11. anonymous

Yay :D

12. jim_thompson5910

notice how they ask  how many total jumps she attempts from her fourth trip down the hill through her twelfth trip

13. jim_thompson5910

they don't want us to start at i = 1

14. anonymous

ooo I didn't realize that!

15. anonymous

So it would be a?

16. jim_thompson5910

yes because it's the only one that starts at i = 4

17. anonymous

Thanks so much :))

18. jim_thompson5910

I would practice on how to compute the sum as well

19. anonymous

Ok I will !