1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
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]


You might be interested in
Ryan is thinking of a number. When he multiplies this number by 6 and then subtracts 15 from the answer, he ends up with his ori
Setler [38]
6n-15=n
minus n both sides
5n-15=0
add 15 both sides
5n=15
divide both sides by 5
n=3
de number is 3
3 0
3 years ago
Please help! I will mark as brainliest. <3
Dmitrij [34]

Answer:

for per meal - $100

for 50 meals - $100 × 50 = $500//

$100 * x = $900

$100 * x = $900

x = $900/$100

x = 9//

Omar needs to sell 9 meals.

8 0
3 years ago
how is the sentence "10 more than p is –3" written as an equation? – 3 = 10 p 10 = –3 p 10 = 3 p = 10 – 3
yarga [219]
This is saying that -3 is the result of a number "p" plus 10...therefore the equation is p+10=-3
8 0
3 years ago
H(x) = 3х – 4<br> What is h(6)?
xeze [42]

Answer:

14

Step-by-step explanation:

h(6) means what is the value of h(x) when x is 6.

The value given for h(x) is 3x-4.

So we need to evaluate the expression 3x-4 for x=6.

Replace x with 6: 3(6)-4

Now perform order of operations.

3(6)-4

18-4

14

8 0
3 years ago
How much do u need to subtract from 41/6 to make 6
dem82 [27]
41/6-5/6 = 36/6
36/6= 6

So 5/6 would need to be subtracted to develop a fraction that divides to 6
4 0
3 years ago
Other questions:
  • An angle with a measure of 180 degrees is formed by two opposite rays true or false
    13·1 answer
  • A die is tossed. find the odds against rolling a number greater than 2.
    13·1 answer
  • Use the distributive property to find an expression that is equivalent to 27x2(second power)-42x+12
    12·1 answer
  • I don't know how to graph this and would appreciate some help!
    15·1 answer
  • F(x)= x^4 -2x^2 -4 What is the domain and range of the function?
    11·1 answer
  • What is the difference between the circumference of a medium pizza and the circumference of a personal pizza? Round to the neare
    6·1 answer
  • Sabrina bought a hoodie at the store when they were having a 25% off sale. If the regular
    5·2 answers
  • A rectangle has a length of x and a width of 4 inches more than the length
    8·1 answer
  • stehpane puts 30 cubes in a box the cubes are 1/2in on each side the box hold 2 layer with 15 cubes in each layer what is the vo
    12·1 answer
  • 24 To raise money for charity, Jalaj walks 22 km, correct to the nearest kilometre, every day for 5 days.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!