3 years ago

What’s 8×10 squared as a decimal

Mathematics

1 answer:

Firlakuza [10]3 years ago

4 0

8*10 squared as a decimal would be 2.8

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Let $a_k$ denote the kth term of the sequence. Then

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$S_n=\displaystyle\sum_{k=1}^na_k=a_1+a_2+\cdots+a_{n-1}+a_n$

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$S_n=\displaystyle\sum_{k=1}^n(a_1+d(k-1))=a_1\sum_{k=1}^n1+d\sum_{k=1}^n(k-1)$

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Then the nth term in the sequence is

$a_n=\dfrac{11}2-5(n-1)=\boxed{\dfrac{21-10n}2}$

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