Simplify the expression.

-5z + 4n + 18z - 10n

A.

13z - 6n

B.

-23z + 14n

C.

22z + 5n

D.

-28z + 8n

What should be true about - 5 and 5? Why?

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A-b when a=-4.5 b=0.5

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