Expression 20: "y" less than 25 Has graph. To audio trace, press ALT+T.y<25
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Expression 21: 0 less than or equal to "y" less than or equal to "f" left parenthesis, "x" , right parenthesis Has graph. To audio trace, press ALT+T.0≤y≤fx
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Expression 22: 0 less than or equal to "y" less than or equal to "f" left parenthesis, "x" , right parenthesis Has graph. To audio trace, press ALT+T.0≤y≤fx
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Expression 23: polygon left parenthesis, "A" , "B" , "C" , "D" , right parenthesis Has graph.polygonA,B,C,D
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Expression 24: "f" left parenthesis, "x" , right parenthesis Has graph. To audio trace, press ALT+T.fx