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# a couple of math questions?

What is the first term of a series whose ratio is 2 and a7 = 64?

1

0

2

This problem cannot be solved; you have to know a1 first.

The lesson used a subway train in New York City traveling between Liberty Avenue and Rockaway Boulevard as an example of a(n):

series.

sequence.

routing.

arithmetic induction problem.

### 1 Answer

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- climberguy12Lv 71 decade agoFavorite Answer
1. it can be solved. just divide by 2^6. giving you 1 as the answer. you do that as a short cut for dividing by 2(the ratio) 6 times, because every time you divide by two reduces the term number by 1. you need to reduce it by 6, so you divide by 2^6.

2. would need to know the example.

make it a good day

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