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34kurt
3 years ago
8

What is the fifth term of the geometric sequence whose first three terms are 486, 162, and 54?

Mathematics
1 answer:
Scorpion4ik [409]3 years ago
3 0

Answer:

6

Step-by-step explanation:

an = ar^(n-1)

a = first term

n = nth term

r = common ratio

r = r2 / r1 = r3 / r2

The first 3 terms are :

486, 162, and 54

Hence,

a = 486

r = 162 / 486 = 1/3

Hence ;

a5 = 486(1/3)^5 - 1

a5 = 486(1/3)^4

a5 = 486(1 / 81)

a5 = 486 * 1 / 81

a5 = 486 / 81

a5 = 6

The 5th term of the geometric progression will be ; 6

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two pumps of different sizes, working together, can empty a fuel tank in 3 hours. the larger pump can empty the tank in 4 hours
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Lets, for ease of understanding, say that the first three number were 64...

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Now lets double check our work.

Mean=(64+64+64+320)/4=512/4=128

Answer=320
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