1)   EMSolution Algebra 70698 of fully explained algebraic solutions. Related math concepts. Formulas proofs. Authoring options to develop didactic materials, variant tests and lesson plans 2)   Basic Electrical Troubleshooting 2.50 Basic electrical training - troubleshooting circuit simulation CBT with lighting circuit example. 3)   EMSolution_Algebra_Equations 2.0 37988 algebraic equations from basic to advanced. Fully explained step by step solutions. Related math concepts. Authoring options to develop didactic materials, variant tests and lesson plans