Improve appearance

Author: gajennings

OpenProblemLibrary/WHFreeman/Holt_linear_algebra/Chaps_1-4/3.5.36.pg

@@ -24,7 +24,6 @@ DOCUMENT();
 loadMacros(
   "PGstandard.pl",
   "MathObjects.pl",
-#  "parserPopUp.pl",
   "parserRadioButtons.pl",
   "parserMultiAnswer.pl",
   "PGmatrixmacros.pl",
@@ -45,7 +44,6 @@ $showPartialCorrectAnswers = 1;
 Context("Matrix");
 Context()->variables->are(a=>"Real",b=>"Real");
 
-#$tf = PopUp(['???','True','False'],'True');
 $tf = RadioButtons(['True','False'],'True', separator => $SPACE x 4 );
 
 $A = Matrix([[Formula("a"),Formula("1-b")],[Formula("1-a"),Formula("b")]]);