Algebra

Can someone help me with these two questions?

What is the 50th term of the sequence that begins -4, 2, 8, 14...?

What is the 20th term of the sequence that begins -3, 6, -12, 24...?

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asked by Tina
  1. a = -4
    d = 6
    T50 = a+49d = -4+49(6) = 290

    a = -3
    r = -2
    T20 = 3(-2)^19 = -1572864

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    posted by Steve
  2. Thank you sooooooo much!!!!!!!!

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    posted by Tina
  3. thx steve you were right (thumbs up)

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