Write the system
?
?
as a matrix equation AX = B, where A is the coefficient matrix of the system, X is a column matrix of variables, and B is the column matrix of constants. Multiply each side of the equation on the left by the matrix inverse of A to obtain an equivalent system of equations and solve it.
?
A. 
B. ?
C. ?
D. ?
E. ?
Answer: B
Mathematics
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55 × 0.4
A. 55.4 B. 22.11 C. 23.1 D. 22
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Evaluate.66 - 7 ? 5 + 135 ÷ (-15)
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Provide an appropriate response.Determine if the expression 8-3 is positive or negative.
A. Negative B. Positive
Mathematics