Expression 2: left brace, 5 less than "x" less than or equal to 10 : negative ( "x" / 5 ) squared plus 3 ( "x" / 5 ) minus 1.5 , right brace5<x≤10:−(x/5)2+3(x/5)−1.5
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Expression 3: left brace, 10 less than "x" less than or equal to 15 : 0.5 ( 3 minus ( "x" / 5 ) ) squared , right brace10<x≤15:0.5(3−(x/5))2