Introduction
This book is designed for you. Its main purpose is to get to-
gether in one place a wide variety of useful and interesting
information involving calculators, the world around you, and
mathematics. It s designed to be a working tool that, when
used with your calculator, becomes a system for problem solv-
ing as well as a key to discovery. We hope you ll have fun
reading and exploring with it.
The Story of Mathematics
It is said that mathematics began long ago in Early Egypt. The
Nile River would flood on occasion and wash away all landmarks
and monuments. People needed a way to know where their land
was after these floods, so methods of earth measurement (later
to be called Geometry) were invented. The Greeks, always
thinking, picked up those techniques, developed them further,
and added new ideas such as Algebra and Trigonometry. Math was
off and running. It was used in oceanic exploration. It was
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