how do you prove: 1. (-1)*(-1)=1 2. 1 is a positive number. Please answer both subparts if you unable to answer both then please answer only second. Tha

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter9: Systems Of Linear Equations
Section9.7: Puzzle Problems
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how do you prove:

1. (-1)*(-1)=1

2. 1 is a positive number.

Please answer both subparts if you unable to answer both then please answer only second. Thanks.

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