Add or subtract as indicated.(4x2 + 5xy + y2) + (4x2 - 2xy - y2) + (x2 + xy - y2)
A. 7x2 + 2xy - y2
B. 8x2 + 3xy - y2
C. 9x2 + 4xy + y2
D. 9x2 + 4xy - y2
Answer: D
Mathematics
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Solve the problem.Evaluate 
at t = 3? for the function w(x, y) = x2 - y2 - 10x; x = cost, y = sin t.
A. -12 B. -14 C. 0 D. -8
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Evaluate the sum.
A. 198 B. 156 C. 58 D. 204
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Find the circumference of the circle whose radius or diameter is given. Use 
or 
as indicated. d = 336 m. Use ? ? 
.
A. C ? 528 m B. C ? 2112 m C. C ? 1056 m D. C ? 354,816 m
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Use substitution to determine whether the system of linear equations has no solutions, one solution, or infinitely many solutions.x - 4 = yy + 9 = x
A. No solutions B. Infinitely many C. One
Mathematics