Question

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

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

Answer 1

Please help!

Answer 2

I'm guessing, and I'm not sure if I'm right or not so...
\[\sum_{1}^{16}9n-4\]

Answer 3

I have that as an answer choice, except the 16 is a 15. None of my answer choices have a 16 on top.

Answer 4

because there are 16 terms, from 1-16,
and there's a difference of 9 between each one,
and -4 is what you start off with

Answer 5

Ok thanks!

Answer 6

wait!!!

Answer 7

Ok

Answer 8

@ballerinaxbb
I think it's wrong

\[\sum_{1}^{15}9n-13\]
because if you sub in 1, for the first value, you THEN get -4

Answer 9

That's not one of my answer choices though :/

Answer 10

I have (-4 + 9n) with a 15 on top and n=0

Answer 11

I have -36n with a 15 on top and n=0

Answer 12

I have (-4 + 9n) with an infinity sign on top and n=0

Answer 13

I have a -36n with an infinity sign on top and n=0

Answer 14

Those are the four answer choices

Answer 15

oh, ok....then probably the first one
cause the infinity shouldnt be right

Answer 16

Yeah, I agree

Answer 17

Thanks for your help! :)

Answer 18

np