91Ó°ÊÓ

Explain the difference between a sequence and a series.

Explain why the sequence 4, 5, 7, 10, 14, … is not arithmetic.

Find the sum of each arithmetic series.

$\underset{n=1}{\overset{7}{∑}}(2n+1)$

Find the indicated term of each arithmetic sequence.

$a_1=−5,d=7,n=13$

68 is the ___?__ th term of the arithmetic sequence -2, 3, 8, ... .

Find the sum of each arithmetic series.

$\underset{k=3}{\overset{7}{∑}}(3k+4)$

Write an equation for the nth term of the arithmetic sequence -26, -15, -4, 7, ... .

Find the first three terms of each arithmetic series described.

$a_1=11,a_n=110,S_n=726$

Find the first three terms of each arithmetic series described.

$n=8,a_n=36,S_n=120$

Find the three arithmetic means between 44 and 92.