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Answer 1

To simplify the expression, we can first distribute the numbers outside the parentheses:

5(0.5k - 1) + 2(0.4 - k)

This gives us:

2.5k - 5 + 0.8 - 2k

Combine like terms:

(2.5k - 2k) + (-5 + 0.8)

0.5k - 4.2

Therefore, the simplified expression is 0.5k - 4.2.