19-06-2017
Mathematics

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Need help on this one plizz help me out plizz

Need help on this one plizz help me out plizz class=

Respuesta :

stevemosby0 stevemosby0

19-06-2017

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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