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3 years ago

How to solve two step matrix

Mathematics

1 answer:

Andreyy893 years ago

3 0

Answer:

In mathematics, a matrix (plural matrices) is a rectangular array (see irregular matrix) of numbers, symbols, or expressions, arranged in rows and columns. Provided that they have the same size (each matrix has the same number of rows and the same number of columns as the other), two matrices can be added or subtracted element by element (see conformable matrix). The rule for matrix multiplication, however, is that two matrices can be multiplied only when the number of columns in the first equals the number of rows in the second (i.e., the inner dimensions are the same, n for an (m×n)-matrix times an (n×p)-matrix, resulting in an (m×p)-matrix). There is no product the other way round, a first hint that matrix multiplication is not commutative. Any matrix can be multiplied element-wise by a scalar from its associated field.

Step-by-step explanation:

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3 years ago

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25% of 132 is what number? Help please lol I’m to dumb.

juin [17]

Answer:

Step-by-step explanation:

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Answer all questions, your combing like terms. Show ALL of you work! Thank you!!

Elanso [62]

Answer:

1. -12x - 9y - 6

2. -12x + 36

3. -240

4. -2

5. x = -57

6. x = -6

7. x = 48

8. x = 20

9. x = -288

10. n = 8

Step-by-step explanation:

-5x - 13 + 3y - 7x - 12y + 7

-12x - 13 + 3y - 12y + 7

-12x - 6 + 3y - 12y

-12x - 6 - 9y

-12x - 9y - 6

-3(4x - 12)

-3(4x) + (-3)(-12)

-12x + 36

6x - 282

6(7) - 282

42 - 282

-240

6x + 2(y + x)

6(-2) + 2(7 + (-2))

-12 + 2(7 - 2)

-12 + 2(5)

-12 + 10

-2

x - 23 = -80

+ 23 +23

x = -57

12x = -72

/12 /12

x = -6

x/4 = 12

* 4 * 4

x = 48

3x + 12 = 72

- 12 - 12

3x = 60

/3 /3

x = 20

x/4 - 8 = -80

+ 8 + 8

x/4 = -72

* 4 * 4

x = -288

10.

-4(1 - 5n) - 8n = 92

-4 + (-4)(-5n) - 8n = 92

-4 + 20n - 8n = 92

-4 + 12n = 92

12n - 4 = 92

+ 4 + 4

12n = 96

/12 /12

n = 8

6 0

3 years ago

A veterinarian collects data on the number of times race horses are raced during their careers. The veterinarian finds that the

SpyIntel [72]

Answer:

c. (12.12, 18.48)

Step-by-step explanation:

Hello!

The study variable is X: number of times a racehorse is raced during its career.

The average number is X[bar]= 15.3 and the standard deviation is S= 6.8 obtained from a sample of n=20 horses.

To estimate the population mean you need that the variable has a normal distribution, in this case, we have no information about its distribution so I'll assume that it has a normal distribution. With n=20 the most accurate statistic to use for the estimation is a Students-t for one sample, the formula for the interval is:

X[bar] ± $t_{n-1;1-\alpha /2} * \frac{S}{\sqrt{20} }$

$t_{n-1;1-\alpha /2} = t_{19;0.975}= 2.093$

[15.3 ± 2.093 * $\frac{6.8}{\sqrt{20} }$ ]

[12.12; 18.48]

Using a significance level of 95% you'd expect that the true average of times racehorses are raced during their career is included in the interval [12.12; 18.48].

I hope it helps!

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