What is the sum of the arithmetic sequence 3,9,15 if there are 34 terms

First we find the common difference ... do this by subtracting the first term from the second term. (9 - 3 = 6) ... so basically, ur adding 6 to every number to find the next number.

we will be using 2 formulas ... first, we need to find the 34th term (because we need this term for the sum formula)

an = a1 + (n-1) * d

n = the term we want to find = 34

a1 = first term = 3

d = common difference = 6

now we sub

a34 = 3 + (34-1) * 6

a34 = 3 + (33 * 6)

a34 = 3 + 198

a34 = 201

now we use the sum formula

Sn = (n (a1 + an)) / 2

S34 = (34 (3 + 201)) / 2

s34 = (34 (204)) / 2

s34 = 6936/2

s34 = 3468 < = = = the sum of the first 34 terms