1) Which of the following is an arithmetic sequence? a) 1,2,3,6,12 ... b) 1,2,4,8,16 ... c) -3,3,-3,3 ... d) 2,8,14,20 ... 2) if a1=4 and the common difference is 3, then what is the sum of the first twenty terms of the sequence? a) 620 b) 650 c) 630 d) 640 3) a1=-3 and a5=5. Find=a10? a) 14 b) 15 c) 16 d) 18 4) (a_n) is an arithmetic sequence with a4=5 and a9=30. Find the common difference.​ a) 5 b) 7 c) 6 d) 4 5) (a_n) is an arithmetic sequence with a11=34 and common difference 3.Find a3 a) 4 b) 10 c) 12 d) 8

Arithmetic sequence

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