Excerpt from Key to Robinson's New Elementary Algebra: For Teachers and Private Learners To many teachers a Key to any mathematical work is not indispensably necessary; but most teachers find that class and school-room duties so fully occupy their time as to make a Key 9. Great convenience, if not a necessity. And teachers of limited acquirements and ex perience, as well as private learners, can not but find a Key of great service. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.