Secret messages can be encoded by using a code and an encoding matrix. If we have the code:
and an encoding matrix E, we can encode a message by taking every two letters of the message, converting them to their corresponding numbers, creating a 2 × 1 matrix, and then multiplying each two numbers by E. The message may be unscrambled with a decoding matrix which is the inverse of the coding matrix, E-1. Determine if the given pair of encoding matrices are inverses of each
other.
and 
What will be an ideal response?
= 
; yes, they are inverses
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Find the probability.When a single card is drawn from an ordinary 52-card deck, find the probability of getting a black 6 or a black 4.
A. 
B. 
C. 
D. 
Provide an appropriate response.4x3y2(6x - 3y + 12) = 24x4y2 - 12x3y3 + 48x3y2. However, 4x3y2(6x - 3y + 12) is not the correct prime factorization of 
Why not?
What will be an ideal response?
Determine whether the pair of lines is parallel, perpendicular, or neither. 9x + 3y = 1221x + 7y = 29
A. Parallel B. Perpendicular C. Neither
Fill in the blank with one of the words or phrases listed below. Not all choices will be used.
A(n) 
is the quotient of two numbers.
A. denominator B. least common denominator C. numerator D. ratio