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IceJOKER [234]
3 years ago
8

Find the difference. –12 – (–21) = _____ –33 –9 33 9

Mathematics
1 answer:
AysviL [449]3 years ago
6 0

Answer:

<h2>9</h2>

Step-by-step explanation:

(-)(-) = (+)

(-)(+) = (-)

(+)(-) = (-)

(+)(+) = (+)

-(-21) = (-)(-21) = (+)21 = 21

-12 - (-21) = -12 + 21           <em>use commutative property: a + b = b + a</em>

= 21 + (-12) = 21 - 12 = 9

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