Programs for Texas Instruments TI-83 Plus:

Click on the link to the program you want to download. Upon completion, if it doesn't automatically unstuff, open it in Stuffit Expander. You will need Stuffit Expander to convert these files to a format readable by your calculator; get a free copy from Aladdin Systems. Then, connect your calculator to the computer, and drag the program into the calculator window to copy it to your calculator for your personal use.

Get Best Fit Line
Based on a list you've entered into the STAT EDIT dialog and you have graphed using the STAT PLOT feature, you can use Best Fit Line to create a Best Fit line for your data. It simply automates the numerous keypresses needed to calculate and display the line. You can view the equation for the line by pressing the "Y=" key once the line has been drawn.

Get Binomial Probability
This allows you, to calculate the probability of an event happening repeatedly, if there are only two outcomes, and a given trial does not influence further outcomes. Under "Total Trials", you enter in the total number of trials (x). Under "Event A Occurs", you enter how many times the expected outcome actually occurred (y). Under "Probability A Occurs", you enter the probability of that outcome occuring, from 0 (never) to 1 (always). The program will then display the probability of the outcome occurring x times out of y trials.

Get Distance
This program will calculate the distance between two points in (X,Y) format.

Get Equation
Often times, the end result of an equation will be irrational, and it can sometimes be hard to go back to the last step. Equation allows you to enter in the variable coefficient and the value on the other side of the equality, and it will then simplify it into both the lowest-terms fraction form and the decimal form.

Get Find GCF
This program is quite simple. It simply gives you the Greatest Common Factor of any two real numbers.

Get Insect
This program, based on a hypothetical situation involving a flying and non-flying insect, determines the shortest distance between two points in a room (the southeast corner at the floor and northwest corner at the ceiling for example). It displays the shortest distance that a land-crawling insect could take to reach the point, and also the distance for a flying insect (straight up and across).

Get Midpoint Formula
Using this program, you can calculate the midpoint of a line segment with the two user-defined ends being two distinct points on the coordinate plane.

Get Profit
This program is a simple accounting program. It prompts you for Total Revenue, and then asks you for Gross Profit, and then Operating Expenses. Taxes are assumed to be at 40%, though that can be easily edited. It tells you the Net Profit before Taxes, Taxes, Net Profit after Taxes, and Percent Profit.

Get Pythagorean Theorem
Using the Pythagorean Theorem, this will allow you to enter in the length of two legs of a right triangle and will then tell you the length of the hypotenuse. If the exact length cannot be displayed, the answer sqaured will be displayed along with an approximation as to the exact answer.

Get Quadratic Formula
This program solves an equation in the form Ax² + Bx + C using the Quadratic formula, given the real number values of A, B, and C.

Get Transition Matrices
This is a program for transition between A, B, and C. It prompts you for the beginning values for each variable, then prompts you for perecentages moving to and from each group. After entering them all in percentage form (.08 for eight percent), it will tell you the resulting totals for A, B, and C.

Get Work Problems
This Add portion of this program solves problems such as "If one man can paint a house in two hours, and another can in five, how long will it take them to do it together". Just enter 2 and 5 as the A and B values, and the program returns the length it takes them to complete the work together. The Subtract portion allows you to do this in reverse; enter the time if the two work together in A, the time for one worker in B, and it returns the time for the other worker.

All programs are by and all are offered free of charge for your use. Please contact me if you wish to redistribute them.
June 2003