Given two terms of an arithmetic sequence find the term identified in the problem.

1. 13 = 233 , 35 = 673

Find 21

2. 10 = 68 , 34 = 212
Find 30


V. Find the missing terms in the following arithmetic sequences

-16_ _ _ _ -46

VI. Evaluate the related series of each sequence.

1. −6, 0, 6, 12, … ; 24 6. 39, 19, −1, −21, … ; 29

2. −15, −13, −11, −9, … ; 52 7. 11, 20, 29, 38, … ; 19​