Simplify by combining like terms.
?
?
A. 
B. 
C. 
D. 
E. 
Answer: A
Mathematics
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Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists.4x - y + 3z=12x + 4y + 6z=-325x + 3y + 9z=20
A. {(2, -7, -1)} B. {(8, -7, -2)} C. ? D. {(-8, -7, 9)}
Mathematics
Write a description of the shaded region using the symbols A, B, C, ?, ?, -, and ' as needed.
A. B' - (A ? B) B. B - (A ? C) C. A' ? C' ? B D. B ? (A ? C)'
Mathematics
Find the exact value of the expression. Do not use a calculator.cos 120° tan 60°
A. - 
B. 
C. 
D. - 
Mathematics
Solve the following system by any appropriate method. If there is no real number solution, so state.xy = 1-20x - y = 9
A. (4, -4), (5, -5)
B. (-4, - 
), (-5, - 
)
C. (- 
, -4), (- 
, -5)
D. no real solution
Mathematics