Solve the system of equations.- 
x + 4y - 2z = -243x - 
y + z = 21 x - 3y + 4z = 28
A. (6, -4, 4)
B. (6, -6, 3)
C. (4, -6, 4)
D. (4, -4, 3)
Answer: D
Mathematics
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Find the derivative of the function at the point p in the direction of a.f(x, y) = e-8y cos x, p = (-2?, 0), a = 
i - j
A. 4
B. 
C. - 4
D. - 
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Solve.In preparation for his new job, Travis bought two suits at $194 a piece, five shirts at $23 a piece, two pairs of shoes at $78 a piece, four ties at $22 a piece, and five pairs of socks at $5 a piece. What was the total cost of these items?
A. $747 B. $322 C. $789 D. $772
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If x = -4 is a root of 
, use synthetic division to factor the polynomial completely and list all real solutions of the equation.
A. 
B. 
C. 
D. 
E. 
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Simplify the expression.
-2/3
A. not a real number
B. - 
C. 
D. 
Mathematics