Answer:
-3
Step-by-step explanation:
-4-(-1) = -4 + 1 = -3
Since you are subtracting a negative, it turns positive so it will be.
-4+1
+0.1
Note that -4.5 + 4.4 = -0.1.
Adding 0.1 to -0.1 results in 0.
The unknown was +0.1.
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