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3 years ago

PLEASE HELP! 50 POINTS!!!!! Which expression(s) are equivalent to -2x + 10

Mathematics

1 answer:

galina1969 [7]3 years ago

7 0

The answer is b hope that helps

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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

Read 2 more answers

0 ) Dan bought 7 new baseball trading cards to add to his collection. The next

harina [27]

Dan started with 69 cards

Step-by-step explanation:

Let x be the initial number of cards

Then

According to "Dan bought 7 new baseball trading cards to add to his collection"

$x+7$

The next day his dog ate half of his collection.

$\frac{1}{2}(x+7)$

There are now only 38 cards left.

$\frac{1}{2} (x+7) = 38$

Multiplying both sides by 2

$x+ 7 = 38*2\\x+7 = 76$

Subtracting 7 from both sides

$x+7-7 = 76-7\\x = 69$

Hence,

Dan started with 69 cards

Keywords: Linear equation, word problems

Learn more about linear equations at:

#LearnwithBrainly

4 0

3 years ago

Solomon has read 1/3 of his book. He finishes the book by reading the same amount each night for 5 nights. A. What fraction of t

Tatiana [17]

A) 2/3 divided by 5/1
= 2/3 X 1/5
= 2/15 of the book

B) 14X5=70
1/3
2/3
3/3
70+35= 105 pages

4 0

3 years ago

I think i had thw correct answers for thr last two but the keep coming up as incorrect

Oksana_A [137]

Answer:

B. 40

C. 8

Step-by-step explanation:

7 0

3 years ago

Include step by step directions MAKE SURE ITS CORRECT

Yuliya22 [10]

Answer:56

Step-by-step explanation:do 180-68, then divide by 2(because the x angles are equal to each other.

7 0

3 years ago