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faltersainse [42]

3 years ago

15

a house on the market was valued at $322,000 after several years the value decreased by 19%, by how much did the houses value de

crease in dollars what is the current value of the house

1 answer:

Sauron [17]3 years ago

6 0

Answer:

61,180 the decrease in house value

Step-by-step explanation:

260,820 is the house current value

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dmitriy555 [2]

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Step-by-step explanation:

We know that

cos 2x = 2cos²x - 1

So we have

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Substituting $x=\frac{19\pi}{12}$

$cos\left ( \frac{19\pi}{12}\right )=\sqrt{\frac{1+cos2\left ( \frac{19\pi}{12}\right )}{2}}\\\\cos\left ( \frac{19\pi}{12}\right )=\sqrt{\frac{1+cos\left ( \frac{19\pi}{6}\right )}{2}}\\\\cos\left ( \frac{9\pi}{12}\right )=\sqrt{\frac{1+cos570}{2}}\\\\cos\left ( \frac{9\pi}{12}\right )=\sqrt{\frac{1-\frac{\sqrt{3}}{2}}{2}}\\\\cos\left ( \frac{9\pi}{12}\right )=\sqrt{\frac{2-\sqrt{3}}{4}}\\\\cos\left ( \frac{9\pi}{12}\right )=\frac{\sqrt{2-\sqrt{3}}}{2}$

$cos\left ( \frac{9\pi}{12}\right )=\frac{\sqrt{2-\sqrt{3}}}{2}$

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