Math
posted by Anonymous .
A message was encoded using the matrix
[7 2
3 1]
and you can decode the message 2 numbers at a time in a [1 x 2] matrix.
Here are the first four numbers:
66 21 119 35
I know it's coded row matrix times the decoder = the uncoded row matrix. (The key is A=1, B=2, etc.) I'm just not sure how to, because i tried it and got really large numbers. Help please?
thank you!

you will need the inverse matrix of
7 2
3 1 which is
1 2
3 7
Respond to this Question
Similar Questions

math,algebra II
I have to work with these types of problems dealing with matrises can someone show me how to solve them.Heres one of them: Directions: Find the values of the variables in each equation in the first matrix it looks like this a+2 3z+1 … 
IST 423 Computer networking
For some reason I'm having trouble posting the question. Here it is hopefully. Q2.CDMA Communication: Stations A and B are expected to communicate using Code Division Multiple Access (CDMA). Binary chipping sequences for A and B are … 
MATHSMatrix
For a given square matrix A the predicted values of matrix B are: predicted B=A(A'A)^(1)A'B why is the matrix C=A(A'A)^(1)A' an idempotent and symmetric matrix? 
Math
I have a few questions about TMatrix. In excel, I am suppose to work with powered matrices to construct a weighted T matrix, using a scalar of .7. Does this mean I multiply each of the powered matrices by .7? 
Computing in Security (Conversion Help)
1.) Encrypt the hexadecimal message F9E8 using the Rail Fence cipher for binary numbers with 3 Rails. [Give answer in hexadecimal encrypted message] 2.) Decrypt the hexadecimal encrypted message CDEF created by the Rail Fence cipher … 
English
Hello. Please tell me if it's possible to say: 1) to declare a message; 2) to announce a message; 3) to sound a message; 4) to voice a message; 5) to present a message; (for example, Diplomats ... a message from the United Nations.) … 
matric
Let matrix p= [6 4] 1 0 If where a and b are real numbers, I is a identity matrix and 0 is a null matrix, find a and b. 
algebra
For problems 13 and 14, assign each letter and a blank space to a number as shown by the alphabet table below. Use the code [1,2_3,7] encode the phrase "ONE QUESTION TO GO" The matrix C=[1,2_3,7] was used to encode a phrase to … 
science
1 A ……... is a rectangular array of numbers that are enclosed within a bracket . horizontal set vertical matrix 2 When the numbers of rows is equal to the numbers of columns equal to 'n'. Where m=n. Then is called….. … 
Math
Hi! I need help with these two questions. Thanks! :) 1.) Can we multiply the Matrix A (which is 3 x 4 matrix) by the other matrix, Matrix B (which is 3 x 4 matrix)?