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3 years ago

What do I do with the x squared

Mathematics

1 answer:

Alexxandr [17]3 years ago

4 0

first, find the square root of 45. and make x normal. a square root cancels out a square. It should be 6.7x

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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

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

$\Rightarrow \ ^nC_2=10$

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

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

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

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

Therefore, 5 players participated in the tournament.

5 0

3 years ago

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Help i need help i can't figure this out

EastWind [94]

Answer: A) 23

Step-by-step explanation:

3^2 + ( 6 - 2 ) ⋅ 4 -6/3

3^2 + 4 ⋅ 4 -6/3

9 + 4 ⋅ 4 -6/3

9 + 16 -6/3

25 - 6/3

75/3 -6/3 = 69/3

69/3 = 23

7 0

3 years ago

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Heather had $89.50 in a bank account. She withdrew $10.25. What was her new balance?

dem82 [27]

Answer:

79.25

Step-by-step explanation:

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3 years ago

In which geometry is there no line parallel to a given line through a point not on the line?

tangare [24]

Answer:

Given a line and a point not on it, no lines parallel to the given line can be drawn through the point. you get an elliptic geometry.

Step-by-step explanation:

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3 years ago

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Which expression is equivalent to 36a-27

sesenic [268]

This answer is a. Just do distributive property

5 0

3 years ago