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Consider a function ?(?,?) whose graph is the bottom half of a sphere radius 10 centered...

Consider a function ?(?,?) whose graph is the bottom half of a sphere radius 10 centered somewhere on the ?-axis. a.Which is greater, ?x(−6,0) or ?y(0,−3)?

b.Which is greater, ?x(0,0) or ?y(−2,5)?

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