Sunday, October 18, 2020

HP 42S/DM42: Height of a Fire, Time to Clear a Corridor

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 HP 42S/DM42:  Height of a Fire, Time to Clear a Corridor HP 42S/DM42/Free42 Program:  FIREHGT The program FHGT approximates the height of a...
Saturday, October 17, 2020

Review: Catiga CS-121

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Review:  Catiga CS-121 Just the Facts: Model:  CS-121 (could be other model numbers) Company: Catiga Type: Graphing Battery:  Case contains ...
Thursday, October 15, 2020

HPCC 2020 Virtual Conference and Document Website

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 HPCC 2020 Virtual Conference and Document Website  HPCC 2020 Virtual Conference The HPCC 2020 Virtual Conference took place on October 10, ...
Sunday, October 11, 2020

Casio Classpad: Theorem of Sós

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Casio Classpad:  Theorem of Sós Introduction: The Theorem of Sós A set of triple rational numbers (a, b, λ) is considered to be a H-triple i...
Saturday, October 10, 2020

Sines and Cosines: Adding and Subtracting Angles

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 Sines and Cosines:   Adding and Subtracting Angles Note:    π/2 radians = 90°,   π radians = 180° Sine sin(x + π/2) = sin(x) cos(π/2) + cos...
Sunday, October 4, 2020

TI-84 Plus CE: Lorenz Curves and the Gini Coefficient

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TI-84 Plus CE:  Lorenz Curves and the Gini Coefficient Introduction - Graphing Income Inequality Developed by Max O. Lornez, the Lorenz curv...
Saturday, October 3, 2020

TI-84 Plus CE and HP 41C: Method of Successive Substitutions

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 TI-84 Plus CE and HP 41C:  Method of Successive Substitutions Repeating the Calculation Again and Again With an aid of a scientific calcula...
Sunday, September 27, 2020

Financial Calculators: Deferred Mortgages: Solving for Payment and Price

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Financial Calculators:  Deferred Mortgages: Solving for Payment and Price Finance Now, Pay Later! When a customer financing a loan or mortga...
Saturday, September 26, 2020

Retro Review: TI-36 Solar

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Retro Review:  TI-36 Solar  Just the Facts: Model:  TI-36 Solar Company: Texas Instruments Type: Scientific Display:  10 digit with 2-digit ...
Sunday, September 20, 2020

Sumat 6

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 Sumat 6 Introduction The Addimult Sumat 6 is a mathmatical aid designed to aid the user in addition and subtraction calculations.  Addimult...
Saturday, September 19, 2020

Casio fx-9750GIII: Beta Curve Fit

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 Casio fx-9750GIII:  Beta Curve Fit The program BETAFIT will fit data to the curve Y = A * x^B * (1-x)^C Restrictions:  0 < x < 1 and ...
Tuesday, September 15, 2020

New TI-Nspire CX/CX II Update

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 New TI-Nspire CX/CX II Update Texas Instruments offers a software update:  5.2.   New to version 5.2:  Python.   Both the handheld software...
Sunday, September 13, 2020

Numworks: Generating a Colorful Matrix

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Numworks:  Generating a Colorful Matrix  (updated 10/18/2021) Introduction Today's script generates a 3 x 3 matrix of random integers fr...
Saturday, September 12, 2020

Casio fx-9750GIII: Happy Integers

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Casio fx-9750GIII: Happy Integers What Makes an Integer Happy?    1.  Take a positive integer 2.  Take the sum of the squares of its integer...