3 years ago

Which of the following is a rational number?

Mathematics

1 answer:

artcher [175]3 years ago

7 0

Hey! Your rational number would be $\sqrt{4}$

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Step-by-step explanation:

2x+10=28

2x=18

x=9

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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

Nina [5.8K]

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

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

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

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

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

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

Therefore, 5 players participated in the tournament.

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3 years ago

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What is 3 5/8 ÷14 please answer this

MissTica

Answer:

29/112

Step-by-step explanation:

3 5/8=29/8

(29/8)/14

(29/8)(1/14)=29/112

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Answer:square, triangle, rectangle

Step-by-step explanation:

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You receive a pay raise of 5%, then a cut of 5%. If your original salary is $45,000, what is your new salary after the raise and

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