Answer
Domain {1}: 6
Domain {2}: 12
Domain {3}: 24
Work Step by Step
Domain {1}: y = (3)(2$^{x}$) = (3)(2$^{1}$) = 3(2) = 6
Domain {2}: y = (3)(2$^{x}$) = (3)(2$^{2}$) = 3(4) = 12
Domain {3}: y = (3)(2$^{x}$) = (3)(2$^{3}$) = 3(8) = 24
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