Arithmetic and Geometric Series and Sequences

Which kind of sequence has a common difference?

Is this sequence arithmetic, geometric, or neither?
{26, 22, 18, 14, ...}

Evaluate the Arithmetic Series

Find the sum for the following series. 

Determine if the situation can be represented by an arithmetic or geometric sequence. Seeds cost $1.20 be packet. The cost for 1 packet, 2 packets, 3 packets and so on. ​ (a)   The value of a baseball card is increasing by 2% every year. ​ (b)   Interest on a Student Loan is 3% compounded bi-annually. ​ (c)   The first 3 terms in the sequence are ​ (d)   You earn $20 a week for allowance. ​ (e)  

The graph of a geometric sequence is ​ (a)   .

Evaluate the series.

Find the sum of the first 25 terms of the series: 6+14+22+30+...

Find the sum of the first 718 terms for the series

2 + 4 + 6 + ... + 1436

What kind of sequence is illustrated below?
 400, 200, 100, 50, 25, ...