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Eddi Din [679]
3 years ago
12

Need help on this one plizz help me out plizz

Mathematics
1 answer:
boyakko [2]3 years ago
4 0
First you have to find the 20th term of the sequence

1.5+(19)(-0.05)=0.55
Then apply the sum formula 20/2*(1.5+0.55)=20.5

The answer is 20.5

Then use the sum formula 2
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The answer to your question is X= 11
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