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2015-03-22T10:12:37+08:00

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 t_{1}
1.) Cannot be determined because an arithmetic sequence has to have 3 given terms, the given example has only 2.

2.) Arithmetic sequence formula:

 t_{n} =  t_{1} + (n-1)d

 t_{8} =  t_{1} + (8-1)-2

2 =  t_{1} + (7)-2

2 =  t_{1} + -14

2 + 14 =  t_{1} + -14 + 14

16      =  t_{1} + 0

16 =  t_{1} = 1st term


Answer: 16

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