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Montano1993 [528]
2 years ago
13

Evaluate the determinant for the following matrix:

Mathematics
1 answer:
VLD [36.1K]2 years ago
3 0
The determinat of

| a     b |
|           |
|c      d |

is: a*d - b*c

So the determinant of:

|3    -5 |
|           |
|1       1 |

is 3 * 1 - 1 * (-5) = 3 + 5 = 8

Answer: option D. 8
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Please work out and explain​
Mekhanik [1.2K]

Answer:

a = 22

b = 31

c = 13

Step-by-step explanation:

The sum is the same in each row, column, and diagonal.

One of the diagonals is already complete.  The sum is:

16 + 25 + 34 = 75

So the first row adds up to 75:

a + 37 + 16 = 75

a = 22

The second row adds up to 75:

19 + 25 + b = 75

b = 31

And the third row adds up to 75:

34 + c + 28 = 75

c = 13

We can check our answer by finding the sum of each column and the other diagonal.

22 + 19 + 34 = 75

37 + 25 + 13 = 75

16 + 31 + 28 = 75

22 + 25 + 28 = 75

3 0
3 years ago
This is how you solve this problem: 4/5 = 3 = 4/5 x 3<br> True<br> False
ivann1987 [24]

Answer:

false

Step-by-step explanation:

because when solving fraction as a equation you divide

6 0
2 years ago
Suppose two $20 bills, three $10 bills, one $5 bill, and seven $1 bills are placed in a bag. If you were to pull a bill at rando
Korolek [52]

Answer:

Assuming that the $1 bill was pulled at random, then the expected value of the amount chosen is \frac{7}{13}.

Step-by-step explanation:

From the given question, the bag contains;

$1 bill = 7

$5 bill = 1

$10 bill = 3

$20 bill = 2

Total number of bills in the bag = 13

Pulling a bill at random, the bills would have an expected value as follows:

For $1 bill, the expected value = \frac{7}{13}

For $5 bill, expected value = \frac{1}{13}

For $10 bill, expected value = \frac{3}{13}

For $20 bill, the expected value = \frac{2}{13}

Assuming that the $1 bill was pulled at random, then the expected value of the amount chosen is \frac{7}{13}.

6 0
3 years ago
5/10 points, 1 question ( no rude answers )
bagirrra123 [75]
The answer is b because all the points lie on the graph
3 0
3 years ago
Read 2 more answers
The perimeter of a square is given as 8x+20. Write two different expressions for the perimeter. Use factoring to write one of th
sveticcg [70]

Answer:

P = 4(2x + 5)

P = (2x + 5)+(2x + 5)+(2x + 5)+(2x + 5)

Step-by-step explanation:

Given that:

Perimeter of square = 4 * s

Where s = side length

If perimeter, P = 8x + 20

Then,

4s = 8x + 20

Divide both sides by 4

4s / 4 = (8x + 20) / 4

s = 2x + 5

P = 4s

P = 4(2x + 5)

Or

P = 2x + 5 in 4 places

P = (2x + 5)+(2x + 5)+(2x + 5)+(2x + 5)

8 0
2 years ago
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