Question

Find t(1) for this arithmetic sequence.

Answer 1

\[d=6, S _{n}=574 , n=14\]

Answer 2

Sorry, for each arithmetic SERIES.

Answer 3

sum of n terms = (n/2)[2a + (n-1)d]
where a = t(1)

574 = 7[2a + 13*6]

solve for a

Answer 4

That makes sense, but the equation that I was given in class was: \[S{n}=\frac{ n }{ 2 } (t{1} + t{n})\]

Is that the same thing? :S

Answer 5

tn is nth term which is a + (n-1)d - yes

Answer 6

Okay, thank you so much :)

Answer 7

yw

tn is last term