Find the identical expression for the following.
?
?
A. 
B. 
C. 
D. 
E. 
Answer: B
Mathematics
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Solve the system of equations using matrices. Use Gaussian elimination with back-substitution.x - y + 4z=205x + z= 4x + 3y + z=-8
A. {(0, 4, -4)} B. {(4, -4, 0)} C. {(0, -4, 4)} D. {(4, 0, -4)}
Mathematics
Multiply.(7y - 8)(49y2 + 56y + 64)
A. 343y3 - 512 B. 343y3 + 512 C. 343y3 + 448y2 - 512 D. 49y3 + 512
Mathematics
Divide. Write the answer in lowest terms and as a whole or mixed number where possible.4 ÷ 
A. 1
B. 
C. 
D. 10
Mathematics
Write the complex number in standard form.
?
?
A. 3 + 
i?
B. 4 + 
i
C. 7 - 
i
D. 3 - 
i
E. 4 - 
i
Mathematics