Unanswered.
http://web2.0calc.com/questions/find-the-percent-of-change-in-altitude-if-a-weather-balloon-moves-from-100-ft-to-103-ft-describe-the-percent-of-change-as-an-increase-or
http://web2.0calc.com/questions/a-us-the-point-2-0-b-8-0-and-c-is-8-5-calculate-the-angle-between-ac-and-the-x-axis
http://web2.0calc.com/questions/2x-10-y-and-y-x-2-elimination-problem
http://web2.0calc.com/questions/at-the-end-of-a-training-programme-students-have-to-pass-an-exam-to-gain-a-cirtificate
http://web2.0calc.com/questions/area-problem_1
http://web2.0calc.com/questions/solve-for-x-50-x-2-x-3
More answers invited or requested.
http://web2.0calc.com/questions/help-please_52
Thanks Gino for looking after those :)