2 years ago

Use absolute value to express the distance between −12 and −15 on the number line.

Mathematics

2 answers:

Juli2301 [7.4K]2 years ago

7 0

Answer:

the answer is d :)

Step-by-step explanation:

Goshia [24]2 years ago

4 0

La respuesta es la por que yo ya la hize D

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In a small chess tournament, 20 matches were played. Find out how many people were involved if it is known that each participant

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Answer:

<em>5</em><em> players participated in the tournament.</em>

Step-by-step explanation:

In a small chess tournament, 20 matches were played.

Let us assume that n number of players participated in the tournament

As in each game 2 players play, so the number of ways they can play is,

$=\ ^nC_2$

As they played 2 games with every other participant in the tournament.

So the total number of games is,

$=\ 2\times ^nC_2$

But it is given to be 20, so

$\Rightarrow \ 2\times ^nC_2=20$

$\Rightarrow \ ^nC_2=10$

$\Rightarrow \dfrac{n!}{2!(n-2)!}=10$

$\Rightarrow \dfrac{n(n-1)}{2}=10$

$\Rightarrow {n(n-1)=20$

As $5\times 4=20$ , so we get n=5.

Therefore, 5 players participated in the tournament.

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2 years ago

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2 years ago

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Step-by-step explanation:

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