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College Mathematics Journal	1
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Demana, Franklin	2
Waits, Bert K.	2

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Around the Sun in a Graphing Calculator.

Peer reviewed

Demana, Franklin; Waits, Bert K. – Mathematics Teacher, 1989

Discusses the use of graphing calculators for polar and parametric equations. Presents eight lines of the program for the graph of a parametric equation and 11 lines of the program for a graph of a polar equation. Illustrates the application of the programs for planetary motion and free-fall motion. (YP)

Descriptors: College Mathematics, Computer Uses in Education, Equations (Mathematics), Graphing Calculators

A Hidden Case of Negative Amortization.

Peer reviewed

Waits, Bert K.; Demana, Franklin – College Mathematics Journal, 1990

The rule of 78 is used by banks and loan companies to compute the amounts due when installment loans are paid early. Describes an unexpected case of negative amortization when the rule is applied. Presents an actual problem and discusses the case. (YP)

Descriptors: Algorithms, College Mathematics, Computation, Computer Oriented Programs