Example (9-1): Determination of optimum values with two independent variables, the following equation shows the effect of the variables (x) & (y) on the total cost for a particular operation: 11900 Ст %3D 2.33х + + 1.86y + 10 ху Determine the value of (x)&(y) which will give the least cost (optimum) value ? :: Solution ::

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Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.