Question

PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
I WILL AWARD MEDAL!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Given the sequence 3, 9, 15, which of the following is equivalent to (look at equation posted below)

Answer Choices

54

102

144

168

Answer 1

wheres the equation?

Answer 2

\[\sum_{n=5}^{8}a_{n}\]

Answer 3

@primeralph

Answer 4

@CarlosGP will help you.

Answer 5

come on it is always good to have a second opinion.

Answer 6

\[a_n=3+6(n-1)=6n-3\]
\[a_5=27\]\[a_8=45\]
\[S=\frac{ 27+45 }{ 2 } \times 4=144\]

Answer 7

Is that right @primeralph

Answer 8

@magbak if you dont trust my solution I can delete it

Answer 9

@magbak Sometimes, understand that the other person may be smarter than me too.

Answer 10

no I trust it ok. I am sorry it is nothing personal just my parents taught me to do that @CarlosGP

Answer 11

In my opinion, it's right.

Answer 12

I am so sorry.

Answer 13

mine taught me to be confident

Answer 14

Me too.
I am so sorry.

Answer 15

never mind