Why does a negative number multiplied by a negative number equal a positive number?
+53 I haven't read over it, but maybe this site will help:http://www.jamestanton.com/wp-content/uploads/2012/03/Curriculum-Newsletter_October-2012.pdf
+53 I haven't read over it, but maybe this site will help:http://www.jamestanton.com/wp-content/uploads/2012/03/Curriculum-Newsletter_October-2012.pdf
