Answer
$-240$
Work Step by Step
There are an odd number of negative numbers, so the product is negative.
Thus,
$4(-3)(-2)(-10)
\\=-(4 \cdot |-3| \cdot |-2| \cdot |-10|)
\\=-(4 \cdot 3 \cdot 2 \cdot 10)
\\=-240$
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