Find an equation for the nth term of the arithmetic sequence. -3, -5, -7, -9, an = -3 - 2 an = -3 + -2(n) an = -3 + -2(n + 1) an = -3 + -2(n - 1)

1) To find out common equation for this sequence, it must be used n=1;2;3;4... etc.
2) to count a₁ use n=1. It is correct only for row    result is (-3)
3) if to verify others value for n:

Where’s the

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