Question

What is the sum of the arithmetic sequence 6, 14, 22 …, if there are 26 terms?

Answer 1

a=6 ,d=8 ,n=26
apply the rule
Sn=n/2(2a+(n-1)d)
_____
Where a= first term ,d=difference between eveery two terms ,n = number of all terms

Answer 2

s26= 26/2 (2(6)+(26-1)8

Answer 3

so the answer is 2756?

Answer 4

right ":D

Answer 5

What is the 25th term of the arithmetic sequence 9, 15, 21, … ?
so with this one it would be
s25=25/2 (2(9) + (25-1)6

Answer 6

so the 25th term would be 153?

Answer 7

yea,u calculate it XD