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3 years ago

Which of the following representations is the same molecule as the one below?

Biology

2 answers:

Flura [38]3 years ago

5 0

The best and most correct answer among the choices provided by the question is the first choice or letter A.

Assuming the black is carbon and grey/white is hydrogen 

I hope my answer has come to your help. God bless and have a nice day ahead!

balandron [24]3 years ago

5 0

Answer:

The correct answer is structure A

Explanation:

The molecule is a hydrocarbon chain, which is composed by carbon atoms (in black) and hydrogen atoms (in grey) and it thas 8 carbons bonded by single bonds. The first and the last carbons has 3 hydrogens, the rest has 2 hydrogens (because they participate in two C-C bonds). The other options are not equal: structure B is a hydrocarbon chain with 7 carbon atoms, structure C has 10 carbon atoms and structure D is composed by a 3-carbon chain bonded to another 3-carbon chain by an hydrogen atom.

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2 years ago

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3 years ago

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3 years ago

If I subtract 20 from my number, then square the result, I get the same answer as if I square my number, then subtract 20 from t

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

expand the equation;

x² - 40x + 400 = x² - 20

collect similar terms together;

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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2 years ago