Question

Write the sum using summation notation, assuming the suggested pattern continues.

-4 + 5 + 14 + 23 + ... + 131

Answer 1

count the spaces between each of the numbers, the spaces are 9, so count from 23 and add 9 and that you answer understand?

Answer 2

whats 23 plus 9

Answer 3

32??

Answer 4

yes :D

Answer 5

think ur missing the point of summation notation
http://www.columbia.edu/itc/sipa/math/summation.html

Answer 6

thanks @callie2240

Answer 7

this are the options i have @callie2240
\[\sum_{n=D}^{15} (-4+9n)\]
\[\sum_{n=D}^{15} -36n\]
\[\sum_{n=D}^{\infty} (-4+9n)\]
\[\sum_{n=D}^{\infty} -36n\]

Answer 8

forget the last two, you are only summing a finite number of terms

Answer 9

unless there are \(...\) after the 131

Answer 10

i assume the first one is actually
\[\large \sum_{n=0}^{15} (-4+9n)\]

Answer 11

ok but why?