Question

I need the assistance of smarter beings than I..... I'm so lost.....

Answer 1

`\sf \bold{ 1 * (-3)^(n-1)}`

Explanation:

first term, a₁ = 1

difference between the terms: -3

• used geometric formula :
  `\bold{\sf a_1 * (r)^(n-1)}`

where "a₁ is first term" and "r refers to common difference"

• formula for this nth term:
  `\sf \bold{ 1 * (-3)^(n-1)}`