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Hunter-Best [27]
3 years ago
8

In a chess tournament, each player plays every other player exactly once. If it is known that 105 games were played, how many pl

ayers were there in the tournament?
Mathematics
1 answer:
diamong [38]3 years ago
3 0

Answer:

15 players played in the chess tournament.

Step-by-step explanation:

When there are 15 players, the first player plays 14 games and step aside.

remaining 14 player

next player plays 13 games. steps aside

remaining 13 players

next player plays 12 games. steps aside

remaining 12 players

next player plays 11 games. steps aside

remaining 11 players

.

.

.

.

Last player plays 1 game and steps aside

remaining 1 player who will not play against himself.

∴ Sum of all games played

= 14 + 13 + 12 + 11 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 105 games played

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What is the slope of a line that is perpendicular to the line with equation 12x+3y=9?
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Answer:

Step-by-step explanation

4x-3=y

perpendicular means

-1/4x-3=y

5 0
2 years ago
The picture below shows a right-triangle-shaped charging stand for a gaming system:
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This question is incomplete because it lacks the diagram of the right angles shaped charging stand.

Find attached to this answer, the appropriate diagram.

Answer:

3(tan 50°)

Step-by-step explanation:

To solve this question, we would be using the Trigonometric function called Tangent.

tan θ = opposite side/ adjacent side

θ = 50°

Opposite side (Height)= Side AC = Unknown

Adjacent side = Side BC = 3 inches

Hence,

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3 years ago
Lines a and b are parallel. If the slope of line a is , what is the slope of line b?
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8 0
3 years ago
Read 2 more answers
What is the algebraic expression that describes the monthly salary?
fomenos

Answer:

D

Step-by-step explanation:

10*20=200

200 + 1020= 1220

Works for the first one

20*20=400

400+ 1020=1420

Works for the second one

30*20=600

600+1020=1620

Works for the third one, and all the others one so forth.


You take the number on the left (10, 20, 30, 40, 50, 60, 70) and times it by 20, replacing the x in the equation with the number on the left side of the table. Then you add the number from said equation to result of the multiplication from the first step.

6 0
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The value of a car depreciates by 40% each year. At the end of 2007 the value of the car was £3600 Work out the value of the car
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The equation should look like this:

(value of the car at the end of 2006) x 0.6 = (value of the car at the end of 2007)

Then you substitute: (value at the end of 2006) x 0.6 = 3600

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Hope this helped you! Feel free to ask me any questions!

3 0
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