It's Jenny's birthday! She invites her three best friends Janey, Jeannie, and Joany
1 answer:
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Answer:
r = -
Step-by-step explanation:
The n th term of a GP is
= a₁
where a₁ is the first term and r the common ratio
Here a₁ = 18 and a₆ = - , then
18 = -
( divide both sides by 18 )
= -
( take the fifth root of both sides )
r = = -
