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Oksana_A [137]
4 years ago
12

Dina encoded a secret phrase using matrix multiplication. She multiplied the clear text code for each letter by the matrix (See

image) to get a matrix that represents the encoded text. By which matrix does Dina multiply the encoded text to get the matrix for the clear text code?

Mathematics
2 answers:
serg [7]4 years ago
7 0

Answer:

C= 1   1

    3  2

Step-by-step explanation:

belka [17]4 years ago
6 0

Dina needs to multiply by the inverse of C. The inverse of a 2×2 matrix is easily calculated from its definition: the transpose of the cofactor matrix divided by the determinant. Here, that is

C^{-1}=\left[\begin{array}{cc}-1&-1\\-3&-2\end{array}\right] \cdot\dfrac{1}{(-2)(-1)-(3)(1)} =\left[\begin{array}{cc}1&1\\3&2\end{array}\right]


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Solve the inequality. Graph the solution.<br><br> −8≤z+6.4<br> The solution is
Oksi-84 [34.3K]
Solve the inequality. Graph the solution.

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5 0
3 years ago
-4(x - 4) = -44<br> pls show steps
mestny [16]

Answer:

15

Step-by-step explanation:

-4(x - 4) = -44

expand

-4*x + -4*-4 =-44

-4x + 16 = -44

-4x = -44 -16

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x=-60/-4

x=15

8 0
3 years ago
If you were to sort 0.8, 1/4, .08, 8/10, what would be the order they would be in (smallest to biggest)?
weqwewe [10]

Answer:


Step-by-step explanation:

0.8 = 8/10 = 80/100

1/4 = 25/100

0.08 = 8/100

8/10 = 80/100

Smallest: .08

In between smallest and largest: 1/4

Largest: 0.8 and 8/10, and they are equal


5 0
4 years ago
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solmaris [256]
I think you should do this equation
4 0
3 years ago
Read 2 more answers
1. Solve the equation m2 + 6m=-4 using the quadratic formula.
sveta [45]

Answer:

-3± √5

Step-by-step explanation:

It is given that,

m² + 6m = -4

<u>Points to remember</u>

Solution of a quadratic equation ax² + bx + c = 0

x = [-b ± v(b² - 4ac)]/2a

<u>To find the solution of given equation</u>

m² + 6m = -4

⇒ m² + 6m  + 4 = 0

Here a = 1, b = 6 and c = 4

m =  [-b ± v(b² - 4ac)]/2a

  =  [-6 ± √(6² - 4*1*4)]/2*1

  = [-6 ± √(36 - 16)]/2

  = [-6 ± √20]/2

  = [-6 ± 2√5]/2

 = -3± √5

6 0
3 years ago
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