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gulaghasi [49]
3 years ago
13

The first term of geometric sequence is 7 and the common ratio is -2. Find the 9th term.

Mathematics
1 answer:
kobusy [5.1K]3 years ago
5 0
a_{1} = 7.

Ratio means multiply/divide.
To get the next number, multiply number by common ratio.
To get a previous number, divide by common ratio.

Since we want the next number...
2nd term: 7 x -2 = -14
3rd term: -14 x -2 = 28
4th term: 28 x -2 = -56
5th term: -56 x -2 = 112

Keep going until 9th term!
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Let x be the jug, \frac{1}{2} for half-filled, y for the weight of the jug when empty.

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Given:

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