The author - Raphael Johnson - holds a Masters in mechanical engineering (UCLV - Cuba) and a Diploma in Education specializing in the teaching of mathematics from the University of the West Indies, St. Augustine, Trinidad. He has many years' experience teaching maths at CSEC (R), CAPE (R) and teachers' college levels in Grenada. He is currently teaching maths, physics and other mechanical engineering courses at T. A. Marryshow Community College, St Georges, Grenada.