3 years ago

Translate: twice the sum of a number and 9 equals 7 into an equation

1 answer:

4 0

$equals\ 7\to=7\\sum\ of\ a\ number\ and\ 9\to n+9\ (n-the\ number)\\twice\ the\ sum\ ...\to2(n+9)\\\\Answer:\boxed{2(n+9)=7}\\\\solution:\\\\2(n+9)=7\ \ \ \ |divide\ both\ sides\ by\ 2\\n+9=3.5\ \ \ \ |subtract\ 9\ from\ both\ sides\\\boxed{n=-5.5}$

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Answer:

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1 year ago

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olga2289 [7]

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Ilia_Sergeevich [38]

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