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Use geometric sequence formulas

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{b(1)=15b(n)=b(n1)(3)\begin{cases}b(1)=15\\\\ b(n)=b(n-1)\cdot (-3) \end{cases}
What is the 4, start superscript, start text, t, h, end text, end superscript term in the sequence?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, start text, p, i, end text or 2, slash, 3, space, start text, p, i, end text