--- loncom/homework/templates/SimpleFormula.problem	2004/08/19 20:29:22	1.4
+++ loncom/homework/templates/SimpleFormula.problem	2009/07/06 17:12:47	1.7
@@ -1,20 +1,19 @@
-<problem>
-<script type="loncapa/perl">$z=&random(1,10,1);
-$constant=&random(1,10,1);
-# y=x+z-constant, solving for x, x=y-z+constant, prettyconstant is for simplifying
-$prettyconstant=$constant-$z;
-$x="y+$prettyconstant";
-# code below substitutes '+-' and '-+' for '-'.  This is used in display of answer
-$x=~s/\+-/-/g;
-$x=~s/-\+/-/g;</script>
-
-<startouttext />If z=$z and y=x+z-$constant, what does x equal?  
-<endouttext />
-
-<formularesponse samples="y@-5:5#10" answer="$x">
-    <responseparam description="Numerical Tolerance" type="tolerance" default="0.00001" name="tol" />
-    <textline size="25" />    
-</formularesponse>
-
-</problem>
-
+<problem>
+
+<script type="loncapa/perl">
+$k=&random(3,6,1);
+$formula="a*x^$k";
+$m=$k-1;
+$derivative="$k*a*x^$m";
+</script>
+
+<startouttext />
+What is the derivative of <tt>$formula</tt> with respect to x?
+<endouttext />
+
+<formularesponse samples="a,x@-3,-3:3,3#4" answer="$derivative">
+    <responseparam description="Numerical Tolerance" type="tolerance" default="0.00001" name="tol" />
+    <textline size="25" />    
+</formularesponse>
+
+</problem>