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4-20.

Each expression below begins with and then adds something to it. As you look at each expression, state which direction you should move on a number line if you start at . Then simplify each expression.

For example, if the expression reads , you would write “left, ,” since from you would move left on a number line units and would end up at .  Homework Help ✎

a.

b.

See the hint for part (a).

Left, .

c.

Which direction should you move to add