Expression 6: left parenthesis, negative left parenthesis, "x" squared plus "y" squared , right parenthesis plus 2 , right parenthesis left brace, "z" greater than 1.8 , right brace left brace, "z" less than 2.4 , right brace−x2+y2+2z>1.8z<2.4
6
Expression 7: left parenthesis, "x" squared plus "y" squared plus "z" squared , right parenthesis equals 2 left brace, "z" less than 0 , right brace left brace, "z" greater than negative 0.2 , right bracex2+y2+z2=2z<0z>−0.2
7
Expression 8: left parenthesis, "x" squared plus "y" squared plus "z" squared , right parenthesis equals 2 left brace, "z" less than negative 0.3 , right brace left brace, "z" greater than negative 0.7 , right bracex2+y2+z2=2z<−0.3z>−0.7
8
Expression 9: left parenthesis, "x" squared plus "y" squared plus "z" squared , right parenthesis equals 2 left brace, "z" less than negative 0.8 , right brace left brace, "z" greater than negative 1.2 , right bracex2+y2+z2=2z<−0.8z>−1.2
9
Expression 10: left parenthesis, "x" squared plus "y" squared plus "z" squared , right parenthesis equals 2 left brace, "z" less than negative 1.3 , right brace left brace, "z" greater than negative 1.5 , right bracex2+y2+z2=2z<−1.3z>−1.5
10
Expression 11: "x" squared plus "y" squared plus "z" squared equals 1.8x2+y2+z2=1.8