How do you solve this problem?

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27 votes

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Answer:

-19.2

Explanation:

Fill in the given values and do the arithmetic.

$\displaystyle x\ \blacksquare\ y=(x)/(y)-xy\\\\4\ \blacksquare\ 5=(4)/(5)-4\cdot5=0.8-20\\\\\boxed{4\ \blacksquare\ 5=-19.2}$

Matt Kramer answered Feb 1, 2022

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