Expression 2: "y" Subscript, 1 , Baseline tilde Start sum from "i" equals 0 to max left parenthesis, "a" , right parenthesis , end sum, "m" left bracket, 1 plus "i" , right bracket "x" Superscript, 1 , Baseline "i" undefinedy1~maxa∑i=0m1+ixi1
Expression 4: "y" equals Start sum from "i" equals 0 to max left parenthesis, "a" , right parenthesis , end sum, "m" left bracket, 1 plus "i" , right bracket "x" Superscript, "i" , Baseliney=maxa∑i=0m1+ixi