3 years ago

Why are fossils not found in igneous rocks?

2 answers:

8 0

It would be that they are made from cooling of lava or magma because they form from magma underground unlike sedimentary rocks.

3 0

It would be that they are made from cooling of lava or magma because they form from magma underground unlike sedimentary rocks

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Natasha_Volkova [10]

The value of the unknown number is 10.5.

Let the unknown number = x

When 20 is subtracted from the number and the result is squared which is equal to the square of the unknown number minus 20:

(x - 20)² = x² - 20

<em>expand the equation;</em>

x² - 40x + 400 = x² - 20

<em>collect similar terms together;</em>

x² - x² - 40x = -20 - 400

-40x = -420

$x = \frac{420}{40}\\\\ x = 10.5$

Thus, the value of the unknown number is 10.5.

Learn more about word problem here: brainly.com/question/18336356

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