# Chapter 2 - Real Numbers - Chapter 2 Test - Page 90: 21

$= -0.48$

#### 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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