Question

What is the sum of the arithmetic sequence 4, 11, 18 …, if there are 26 terms?

Answer 1

Tn=a+(n-1)d
d= common difference
a= first term
n = no. of term
Sn=0.5(a+l)
l= last term

Answer 2

d = 7 .thats all i got :(

Answer 3

d = 7, a = 4, n = 26...

Answer 4

a=4 d=7
there fore
T26=4+(25)7
= 179

Answer 5

A) 1,482
B) 1,534
C) 2,379
D) 2,470

Answer 6

those are my choices

Answer 7

well i did a slight mistake in formula Sn=0.5n(a+l) so
Sn=0.5*26*(4+179)

Answer 8

its 2379

Answer 9

i got 2327 but thats not a choice

Answer 10

u r doing wrong
its Sn=0.5*26*(4+179)

Answer 11

u got it now???