Presented is a method utilizing partial derivatives for determining the energy saved per dollar by substituting bicycling for driving a car while not reducing jobs dependent upon the auto industry. (SL)

Summarizes the results obtained from two questionnaires sent by the study group of the British Committee on Chemical Education which was set up to look at the problems of students' computational inability. included are four positive recommendations on textbook preparation, examination techniques, and inservice teacher training. (CC)

Modular arithmetic is used to find the frequency of Friday 13th's in any year. (MM)

Presents two simple methods of calculating the respective terrestrial westward and eastward displacements of a vertically projected and a perpendicularly dropped body which give due emphasis to physical principles, including Kepler's law, conservation of angular momentum, and nonrotating coordinate system with origin at the earth's center. (CC)

This article has been written to point out why the analysis of covariance is a useful technique even when there is no difference between the groups being compared in terms of mean scores on the concomitant variable. (Author)

Describes the method for verifying the accuracy of the shadow-stick method of determining east-west line with the shadow of sun. Description is also included for determining South by using a watch-shadow method. (Author/PS)

Four methods of finding the range of values of the solution of a problem when the data are known to lie within given bounds are illustrated. (MS)

The nature and purposes of secondary school mathematics are discussed, with specific analysis of the role of algebra. Appropriate topics are suggested, with elaboration on level of abstraction and usefulness. (DT)

As one way of applying and enriching mathematics instruction through integration with science, four mini-projects'' are briefly presented. The three topics are oil molecule estimation, animal classification, graphing and genetic sequences. (MS)

Purpose of this paper is to report the level of power for recent statistical tests reported in the AERJ and to propose alternative reporting schemes relative to hypothesis testing to include power and effect size. (Author)