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Nastasia [14]
2 years ago
9

The sum of an unknown and eight is twenty. What is the unknown?​

Mathematics
2 answers:
gregori [183]2 years ago
7 0

Answer:

12

Step-by-step explanation:

We can transform this into an equation in which the unknown will be represented by x. The word "sum" shows us that we are using addition, and we already know that we are adding 8 to the unknown (or x) and the answer to the equation is 20. Lets put this into a number equation now.

x+8=20

Now we just undo the equation. We have to subtract 8 from both sides.

x+8(-8)=20(-8)

x=12

The answer is 12. :) have a good day!

Zarrin [17]2 years ago
4 0

indicates subtraction

20 - 8 = 12

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3 years ago
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Answer: Choice C)  {6, 9, 12}

=======================================================

Explanation:

Something like choice A can't form a triangle because the first two sides add to 6+9 = 15, which is <u>not</u> longer than the third side 15. We need to have x+y > z to be true. The same goes for choice B as well because 3+3 = 6 is too small compared to the third side 7. Choice D is similar to choice A.

In short, we can rule out choices A, B, and D.

The only thing left is choice C. Picking any two sides leads to having that sum be larger than the third side

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Step-by-step explanation:

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