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jeka57 [31]
3 years ago
10

In a huge chess tournament, 66 games were played. Find out how many people were involved if it is known that each participant pl

ayed one game with every other participant in the tournament.
Mathematics
1 answer:
Elanso [62]3 years ago
7 0
There was 12 players
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Beth and Pranav are selling cheesecakes for a school fundraiser. Customers can buy New York
Advocard [28]

Answer:

Cost of one New York style cheesecake  = $5

Cost of one apple cheesecake = $9

Step-by-step explanation:

Let cost of one New York style cheesecake be = x

Let cost of one apple cheesecake be = y

Given:

3 New York stile cheesecake and 7 apple cheese cake were sold for a total of $78.

Cost of 3 New York style cheesecake be = 3x

Cost of 7 apple cheesecake be = 7y

Total = $78

We have:

A) 3x+7y=78

12 New York stile cheesecake and 12 apple cheese cake were sold for a total of $168.

Cost of 12 New York style cheesecake be = 12x

Cost of 12 apple cheesecake be = 12y

Total = $168

We have:

B) 12x+12y=168

Dividing each term in equation B by 12.

\frac{12x}{12}+\frac{12y}{12}=\frac{168}{12}

x+y=14

Solving for x in terms of y

Subtracting y both sides.

x+y-y=14-y

x=14-y

Substituting x=14-y in equation A.

3(14-y)+7y=78

Using distribution:

42-3y+7y=78

42+4y=78

Subtracting both sides by 42.

42+4y-42=78-42

4y=36

Dividing both sides by 4.

\frac{4y}{4}=\frac{36}{4}

∴ y=9

Substituting y=9 in x=14-y

∴ x=14-9=5

∴ Cost of one New York style cheesecake  = $5

∴ Cost of one apple cheesecake = $9

8 0
3 years ago
Give three numbers between 8 and -8
Scorpion4ik [409]

2, -1, -4

you have -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3 , 4 , 5, 6 , 7. 8

4 0
3 years ago
Read 2 more answers
ANSWER THIS PLEASE!!​
Kryger [21]

Answer:

7

Step-by-step explanation:

8 0
2 years ago
Let A be a 5 × 4 matrix with a pivot in each column. Is A invertible? Why or why not?
erastova [34]

Answer:

Matrix A is not invertible.

Step-by-step explanation:

Invertible matrix are those matrix which are square matrix or non singular matrix.

For any matrix to be invertible, matrix should be non singular i.e. det(x)\neq 0.

But for the question given above we cannot find determinant of matrix A as it is not square matrix. so inverse of given matrix does not exist. so it is not possible to have non trival solutions.

6 0
3 years ago
The answer would be 7/8 right?
trasher [3.6K]
Yes, it would be what you have written
6 0
3 years ago
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