1. if z varies jointly a x andy and if x=2 when y=5 and z=10, find z when x =6 and y=12 2. if z varies jointly as x and y and if z=2 when y=4 and x= -6, find x when z=4 and y=8
3. if z varies jointly as x and y and if x=4 when y=6 and z=1,find when x=8 and y=3
3. if z varies jointly as x and y and if x=4 when y=6 and z=1,find when x=8 and y=3
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