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What are “like terms”? why can we only add like terms?

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

Deepak plotted these points on the number line. point a: –0.3 point b: – 3 4 point c: – 11 4 point d: –0.7 which point did he plot incorrectly?