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8. Determine the domain D for which each of the following formulas defines z as a function of x and y. 1-22 (a) z

8. Determine the domain D for which each of the following formulas defines z as a function of x and y. 1-22 (a) z = (b) zx y +2. - (c) z = x + (y 1). - (d) z = x+ y 9. - (e) z = (x + y). (f) z = (x + y+3). (g) z =

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