Write a matrix equation equivalent to the system of equations.7x - 4y + 12z = 9 7y - 8z = 7
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Answer: D
Mathematics
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Evaluate.140
A. -1 B. 0 C. 14 D. 1
Mathematics
Evaluate the expression.-73
A. 21 B. -21 C. -343 D. 343
Mathematics
Factor the polynomial completely.8x2 + 17x - 21
A. (x - 7)(8x + 3) B. (x - 3)(8x + 7) C. (x + 3)(8x - 7) D. prime
Mathematics
Add and simplify. 
+ 
A. 
B. 
C. 
D. 
Mathematics