Question

What is the sum of the first 30 terms of this arithmetic sequence?
6, 13, 20, 27, 34, …

PLEASE HELP

Answer 1

\(\large\color{slate}{ d=(a_n)-(a_{n-1}) }\) find the difference:

Answer 2

A. 3225

B.3255

C. 3325

D.3525

Answer 3

Find the difference (d), with the formula I gave;

\(\large\color{slate}{ a_{30}=a_1+d(30-1)=? }\) (do this after knwoing the d)

then use: \(\large\color{slate}{ S_{30}=(1/2)\cdot(30)\cdot(a_1+a_{30}) }\)

Answer 4

I got b, this is a pretest

Answer 5

@SolomonZelman

Answer 6

is that right

Answer 7

@Loser66

Answer 8

@eliassaab

Answer 9

nm its a

Answer 10

so a or b?

Answer 11

a

Answer 12

@SolomonZelman

Answer 13

yes it is A.

Answer 14

I was absent sorry for replying late