Expression 5: 2 "x" minus 10 left brace, 10 less than or equal to "x" less than or equal to 20 , right brace2x−1010≤x≤20
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Expression 6: 0.2 times left parenthesis, "x" minus 20 , right parenthesis squared plus 30 left brace, 20 less than or equal to "x" less than or equal to 25 , right brace0.2·x−202+3020≤x≤25
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Expression 7: negative 0.2 times left parenthesis, "x" minus 25 , right parenthesis squared plus 35 left brace, 25 less than or equal to "x" less than or equal to 30 , right brace−0.2·x−252+3525≤x≤30
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Expression 8: negative 0.1 times left parenthesis, "x" minus 30 , right parenthesis squared plus 30 left brace, 30 less than or equal to "x" less than or equal to 40 , right brace−0.1·x−302+3030≤x≤40