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Answer all 7. (14pts) Given the functions f(x, y) = 10x - 15y + 5 , find and simplify: (a) Domain of f ( d)

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7. (14pts) Given the functions f(x, y) = 10x - 15y + 5 , find and simplify: (a) Domain of f ( d) f ( -5, 7 ) (b) f ( 2, 3 ) (e) f(x, x2 ) (c) f(0, - 1) ( f) f(x - y, x ty) 8. (6pts) Given the two-variable function f(x, y) - 3x In(2.x + 3y) - 4y - 6, find the first-order partial derivatives

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