Expression 4: "y" equals "d" "x" Has graph. To audio trace, press ALT+T.y=dx
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Expression 5: "y" equals negative StartFraction, "d" left parenthesis, "r" "x" minus 1000 , right parenthesis Over 1000 times "e" Superscript, StartNestedFraction, "r" "x" NestedOver 1000 , EndNestedFraction , Baseline , EndFraction Has graph. To audio trace, press ALT+T.y=−drx−10001000·erx1000
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Expression 6: "y" equals 0 times "x" Has graph. To audio trace, press ALT+T.y=0·x
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Expression 7: StartFraction, 1000 Over "r" , EndFraction equals 11000r