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The problem of nonresponse due to refusals to participate is usually
Equation
A mathematical statement that asserts the equality of two expressions, typically involving variables and constants.
Graph
A visual representation of data or mathematical functions, usually drawn on a coordinate plane, showing the relationship between two or more variables.
Equation
An equation is a mathematical statement that asserts the equality of two expressions, represented by the symbol "=".
Graph
A visual representation of data or a mathematical function using a coordinate system.
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