A Theoretical and Practical System of Arithmetic, etc

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John W. Parker, West Strand, 1843 - Arithmetic - 316 pages
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Page 212 - Multiply each payment by its term of credit, and divide the sum of the products by the sum of the payments ; the quotient will be the average term of credit.
Page 305 - The distance of the centre of gyration from the point of suspension or the axis of motion, is a mean proportional between the distances of the centres of oscillation and gravity from the same point or axle.
Page 308 - Multiply the difference a between 32, and the mean temperature of the air by 21, and take the sum or difference of this product and 87 feet. This is the height through which we must rise to cause the barometer to fall from 30 inches to 29,9.

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