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Zigmanuir [339]
3 years ago
14

-2x - 7 = 3 need the answer

Mathematics
1 answer:
dedylja [7]3 years ago
5 0

Answer: x = -5

Step-by-step explanation:

-2x - 7 = 3

x = -5

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\bf \begin{array}{ccll}n&term&value\\\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\1&a_1&-1\\2&a_2&2\times a_{2-1}\\&&2\times a_1\\&&-2\\3&a_3&2\times a_{3-1}\\&&2\times a_2\\&&-4\\4&a_4&2\times a_{4-1}\\&&2\times a_3\\&&-8\\5&a_5&2\times a_{5-1}\\&&2\times a_4\\&&-16\\6&a_6&2\times a_{-1}\\&&2\times a_5\\&&-32\end{array}

now on this new edited version

\bf -8~~,~~\stackrel{-8+5}{-3}~~,~~\stackrel{-3+5}{2}~~,~~\stackrel{2+5}{7}....67

so, as you can see, the "common difference" of this arithmetic sequence is d = 5, hmmm what term is 67 anyway?

\bf n^{th}\textit{ term of an arithmetic sequence}\\\\a_n=a_1+(n-1)d\qquad \begin{cases}n=n^{th}\ term\\a_1=\textit{first term's value}\\d=\textit{common difference}\\a_1=-8\\d=5\\a_n=67\end{cases}\\\\\\67=-8+(n-1)5\implies 67=-8-5+5n\implies 67=-13+5n\\\\\\80=5n\implies \cfrac{80}{5}=n\implies 16=n\qquad ~~~~~~~~~~\boxed{\sum\limits_{i=0}^{15}~-8+5i}

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The number is 460. So 16% of that number would be 73.6
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