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Covert observers and participants cannot take notes openly.
Mixture
A substance made by combining two or more different materials without chemical bonding or other chemical changes, so that each material retains its own properties.
Pounds
A unit of weight commonly used in the United States and the British imperial system, equivalent to 0.453592 kilograms.
Consistent
In the context of systems of equations, a property indicating that the system has at least one solution.
Inconsistent
Describes a system of equations that has no solution because the equations represent parallel lines which never intersect.
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