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=> 2x - 15y - 9
B. 5x - (-3x) - 3y - 5y + 7 - (-4)
=> 5x + 3x - 8y + 7 + 4
=> 8x - 8y + 11
C. -x^2 - 5x^2 - 6xy- (-9xy) + 3y^2 - (-4y^2)
=> -6x^2 - 6xy + 9xy + 3y^2 + 4y^2
=> -6x^2 + 3xy + 7y^2