Answer:
2k
Explanation:
-k has an invisible 1 in front of the k that makes it -1k.
so
-1k+3k=2k
-1+3=2
-1k+3k= 2k
-k+3k= 2k
Positive sign because 3k is greater than -k on the number line.
Numbers that are greater on the right side.
Numbers that are negative are on the left side.
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