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4 years ago

9

Last winter in the northeast the temperature was 3 degrees Fahrenheit at midnight it dropped 7 degrees every hour for 2 hours an

d then rose 4 degrees every hour after that what was the temperature at noon?

1 answer:

Soloha48 [4]4 years ago

4 0

The answer is 29 degrees at noon

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How can you verify that the solution to a proportion is correct?

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<em>Answer:</em>

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3 years ago

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Fiesta28 [93]

$\textbf{a)}\\\\~~~~~~~x(3x-4)=5\\\\\implies 3x^2 -4x = 5\\\\\implies 3x^2 -4x=5\\\\\implies x^2 - \dfrac 43 x = \dfrac 53\\ \\\implies x^2 - 2\cdot \dfrac 23 \cdot x + \left( \dfrac 23 \right)^2 - \left( \dfrac 23 \right)^2 = \dfrac 53\\\\\implies \left(x-\dfrac 23 \right)^2 = \dfrac 53 + \dfrac 49\\\\\implies \left(x-\dfrac 23 \right)^2= \dfrac{19}{9}\\\\\implies x- \dfrac 23 = \pm\dfrac{\sqrt{19}}3\\\\\implies x=\dfrac 23 \pm\dfrac{\sqrt{19}}3\\\\$

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