Find all the first partial derivatives of z = 5a y-8y. (Choose all applicable answers.) O z = 40x'y- 40x y3 O zy = 30z y- 32a*y3 %3D O zy = 40z"y –- 40x*y³ %3D O zy = 30z'y –- 32z*y3 O z, = 30x'y5 - 32z*y3 O z, = 40x y-40z y O Zy 40z y-40x y %3D 30815 325 3

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