Find the natural domain of the function.f(x, y) = 
A. All points in the x-y plane except (0, 0)
B. All points in the x-y plane except 
C. All points in the x-y plane except x = 0
D. All points in the x-y plane
Answer: C
Mathematics
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Solve the system of equations.7x + 7y + z = 1 x + 8y + 8z = 89x + y + 9z = 9
A. (-1, 1, 1) B. (1, -1, 1) C. (0, 1, 0) D. (0, 0, 1)
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Find the mass of the wire that lies along the curve r and has density ?.C1: r(t) = (6 cos t)i + (6 sin t)j, 0 ? t ? 
;C2: r(t) = 6j + tk, 0 ? t ? 1; ? = 3t3
A. 
units
B. 
?3 units
C. 
units
D. 3?3 units
Mathematics
Solve the equation.x2/3 = 3x1/3
A. {0, -27} B. {0, 3} C. ? D. {0, 27}
Mathematics