by 
mander
ANSWERS: 6
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A ruler?
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A credit card............Think about it
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a ruler,
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A straight-edge is used to draw a straight line. The actual edge is some sort of durable material, such as metal or hard plastic, that can be machined straight. A ruler is used to measure distance, it does not have to have an absolutly straight edge. A yard or meter stick is often soft wood and can have nicks and waves on the edge. Some straight edges may include a ruler, T-squares and triangles have straight edges and are used in drafting and other operations. A string can be used to establish a straight line if stretched tight between two points. A laser beam can project a straight line.__________________________________________________________________________________, Hmmm,seems a keyboard can do it too.
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two points on a graph.... you can always construct a straight line between them.
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A level? A ruler?
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