# NACIONALFINANCE

Sorted independent finance guides are full of helpful information on everyday money matters.

### Mathematical Art: TI-84 Plus CE

Mathematical Art:  TI-84 Plus CE Pixel art generated with the TI-84 Plus CE.  The program is listed below each picture. Radian:FnOff  ClrDraw:ZStandard For(A,­10,10,.1) For(B,­10,10,.1) fPart((A^2+B^2)/2)→C If C=0 Then Pt-On(A,B,1,BLUE) Else Pt-On(A,B,1,RED) End End End Radian:FnOff …Continue Reading

### Floating Point Base Conversions with Scientific Calculators

Floating Point Base Conversions with Scientific Calculators Introduction Any scientific calculator that has base conversions will operate on integers only.  But what if we want to find hexadecimal representation of π?  According to the TI…Continue Reading

### Retro Review: Calculated Industries Qualifier Plus IIImx, Model 3440

Retro Review:  Calculated Industries Qualifier Plus IIImx, Model 3440 General Information Company:  Calculated Industries Type:  Finance/Banking Display:  9 digit alpha-numeric display Power:  2 LR44 or 2 A76 batteries   Memory:  1 independent memory (store, recall,…Continue Reading

### HP 20S and 21S: Heron's Triangle

HP 20S and 21S:  Heron’s TriangleIntroductionThe following program calculates the area of a triangle knowing the three lengths.  The area is determined by Heron’s formula:Area:  √(s * (s – a) * (s – b) *…Continue Reading

### HP 20S and HP 21S: Rounding Numbers

HP 20S and HP 21S:  Rounding NumbersIntroductionThe following program will allow the user to round any positive number to any number of decimal places, regardless of fixed decimal settings. This is based off the algorithm:x_rounded =…Continue Reading

### HP 20S and HP 21S: Approximating Stopping Distances

HP 20S and HP 21S:  Approximating Stopping Distances  Introduction We can approximate the stopping distance (in feet) of a vehicle on dry pavement given the vehicle’s speed (in miles per hour, mph) by the formula: …Continue Reading

### HP 20S and HP 21S: Qualifying Loan Amount (28:36 ratio)

HP 20S and HP 21S:  Qualifying Loan Amount (28:36 ratio) Introduction The program presented in today’s blog entry will calculate the qualifying loan amount given the following: *  Loan’s annual interest rate and term (in…Continue Reading

### HP 20S and HP 21S: Precession

HP 20S and HP 21S: Precession  Introduction The program PRECESS estimate the new position (right ascension (RA), declination (δ)) of a celestial object given their position in Epoch 2000 with the object’s proper notion.  Estimation…Continue Reading

### TI-84 Plus CE: Storing Names in a Concentrated String

TI-84 Plus CE: Storing Names in a Concentrated String  Introduction The program STRNAMES allows the user to store a list of names in a single string.  There are only 10 string variables for the TI-84…Continue Reading

### Casio Desktop Calculators: Calculating at a Very Fast Speed

Casio Desktop Calculators:  Calculating at a Very Fast Speed Introduction: Wow That’s Fast! Recently, there is a discussion on the Museum of HP Calculators forum on “postfix algebraic scientific calculators still in production”.  The conversation…Continue Reading