Question

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.

Answer 1

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

Answer 2

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

Answer 3

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

Answer 4

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

Answer 5

I meant 306 jumps for the last one:)

Answer 6

@jim_thompson5910

Answer 7

I think that it's either A or B

Answer 8

what made you narrow your choices down to A or B?

Answer 9

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

Answer 10

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

Answer 11

Yay :D

Answer 12

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

Answer 13

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

Answer 14

ooo I didn't realize that!

Answer 15

So it would be a?

Answer 16

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

Answer 17

Thanks so much :))

Answer 18

I would practice on how to compute the sum as well

Answer 19

Ok I will !