Fix bug 4684

Author: gajennings

OpenProblemLibrary/MC/PreAlgebra/setPreAlgebraC04S02/Exponents04.pg

@@ -102,7 +102,7 @@ $exp[4] =\{ ans_rule(10) \}
 $ECENTER
 $PAR
 $BITALIC
-To enter something like \(c^n\) in exponential form, type c^n. 
+To enter something like \(c^n\) in exponential form, type c${CARET}n. 
 $EITALIC
 
 END_TEXT
@@ -121,7 +121,7 @@ ANS( Compute("$ans[3]")->cmp() );
 ANS( Compute("$ans[4]")->cmp() );
 
 BEGIN_HINT
-Use the ^ symbol for powers.  For example 4 cubed is 4^3.
+Use the $CARET symbol for powers.  For example 4 cubed is 4${CARET}3.
 END_HINT
 
 ENDDOCUMENT();