In Exercises 77-80, find (3) (x) and the domain of g. Express each quotient function in simplified form. 77. f(x) = V48x, g(x) = V3x² 78. f(x) = Vx² – 25, g(x) = Vx + 5 %3D 79. f(x) = V32r°, g(x) = V2r² %3D 80. f(x) = V2r°, g(x) = V16x

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