Expression 18: "y" equals negative .0 0 1 left parenthesis, "x" plus 200 , right parenthesis squared plus 160 left brace, negative 251.3 less than or equal to "x" less than or equal to 191 , right bracey=−.001x+2002+160−251.3≤x≤191
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Expression 19: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 3000x+4502+y−4002=3000
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Expression 20: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 2700x+4502+y−4002=2700
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Expression 21: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 2400x+4502+y−4002=2400
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Expression 22: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 2100x+4502+y−4002=2100
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Expression 23: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 1800x+4502+y−4002=1800
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Expression 24: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 1500x+4502+y−4002=1500
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Expression 25: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 1200x+4502+y−4002=1200
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Expression 26: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 900x+4502+y−4002=900
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Expression 27: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 600x+4502+y−4002=600
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Expression 28: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 300x+4502+y−4002=300
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Expression 29: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 200x+4502+y−4002=200
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Expression 30: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 100x+4502+y−4002=100
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Expression 31: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 90x+4502+y−4002=90
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Expression 32: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 80x+4502+y−4002=80
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Expression 33: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 70x+4502+y−4002=70
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Expression 34: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 60x+4502+y−4002=60
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Expression 35: left parenthesis, "x" plus 450 , right parenthesis squared plus left parenthesis, "y" minus 400 , right parenthesis squared equals 50x+4502+y−4002=50