Work Step by Step
We first plug in the values given for the variables, and then we solve: $0.2x - 0.3y - xy$ $= 0.2(0.4) - 0.3(0.8) - (0.4)(0.8)$ $= 0.08 - 0.24 - 0.32$ $= 0.08 - 0.56$ $= -0.48$
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