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 306 - Multiply the difference between 32° and the mean temperature of the air by -21, and add the product to 87, if the mean temperature be above 32°, but subtract it if below. 2. Multiply the sum or difference, found above, by thirty times the difference, between the barometric heights, in tenths of inches, and divide the product by the mean of the barometric heights, the quotient will give the approximated elevation.
Page 210 - 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 266 - Given the area of a circle, to find its diameter: Rule. — Divide the area by .7854, and extract the square root of the quotient.

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