Answer 5,6,7 5.If y=(2x+7)2 , then what is  dy/dx? A.dy/dx=2(2x+7)  B.dy/dx=2 C.dy/dx=4x  D.dy/dx=8x+28 6.If   y=3xsin(4x),then what is  y′? A.y′=2xcos(4x)+3cos(4x^2)  B.y′=12xcos(4x)+3sin(4x)  C.y′=cos(4x)+sin(4x)+3x D.y′=2xcos(4x)+3sin(4x) 7.If y=8x+4√y=8x+4 ,  then what is  dydxdydx? A.dy/dx=4x(x+4) B.dy/dx=−4(x+4)−3/2  C.dy/dx=8√x+4 D.dy/dx=−4√x+8

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