Spot the mistake in each of the following and make the necessary corrections:
a) \( 9 + (-12) = 21 \)
b) \( -3 + (-5) = -2 \)
c) \( -13 + C = 17 \)
a) \( 9 + (-12) = -3 \) (Mistake: Wrong sign)
b) \( -3 + (-5) = -8 \) (Mistake: Incorrect addition of negatives)
c) \( -13 + 30 = 17 \) (Mistake: Missing value for C)
b) \( -3 + (-5) = -8 \) (Mistake: Incorrect addition of negatives)
c) \( -13 + 30 = 17 \) (Mistake: Missing value for C)
MR/Nasef.N
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