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DedPeter [7]
2 years ago
5

Find the common ratio for the following sequence. 27, 9, 3, 1, ... User: Find the common ratio for the following sequence. 1/2,-

1/4, 1/8, -1/16 User: What is the seventh term of a sequence whose first term is 1 and whose common ratio is 3? 243 729 2,187
Mathematics
2 answers:
yuradex [85]2 years ago
8 0

Answer:

My answer is 1/3 !!!!! Lmk if it's right or not

saveliy_v [14]2 years ago
4 0
R=common ratio= an / an-1
27,9,3,1.....;
 r=an/an-1= a₂/a₁=9/27=1/3

r=1/3.


1/2,-1/4,1/8,-1/16
r=an/an-1=(-1/4) / (1/2)=-2/4=-1/2

r=-1/2.

a₁=1
r=3
an=a₁*r^(n-1)
a₇=1.3⁷⁻¹=3⁶=729

a₇=729
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We want to find the cost of a notepad considering a magazine costs $3 and we buy 2 notepads and the total cost of the magazine and the 2 notepads is $13 so we can set up an equation to represent this situation. Let 'n' be notepads and that's the value we are solving for so,

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