15. Find the missing number: ___-(-12) = 21
A. 33 B.-33 C. 9 D. -9
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15. Find the missing number: ___-(-12) = 21
A. 33 B.-33 C. 9 D. -9
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Answer:
C. 9
Solution:
X-(-12) =21
x+12= 21
x= 21-12
x=9
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