In a product life cycle, the emission of CO 2 and the use of water depend on

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In a product life cycle, the emission of CO2 and the use of water depend on three variables, xi, i= 1,2,3, according to the following equations: yco2 = 100x + 11x2-7x3; YH20=22x1-x2 +50x3. The nominal values of xi, are 10, 50, and 5. 

1. Using sensitivity analysis, determine the variable whose accuracy is most important. 

2. If the range of variation of each variable is x1~ [45, 55], x2 ~ [24, 36], x3~ [4,7], determine the range of values for CO2 emissions and water use. Also determine the most important variables.

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