Archive for April 2015

How many apps does the ti89 hold

Q: Also, can the TI89 have more than one app installed at the same time, due to space requirements? A: Absolutely. Typically users have more than 20 apps installed on their TI89s. There is plenty of available memory.

Probability density functions

1-Moment Generating functions are to be added. 2-Probabilty Density Function They are under F3 3- Uniform Density Function Also under F3. Option 2 in dropdown lets you accumulate. 4- Cumulative Density Function. Also under F3. cumulative option is in the dropdown options.

Apps are locked after dropping TI89 calculator

> Q: I dropped my calculator and for some reason when I tried to access the apps, it asked for my activation codes again. Now my apps are locked. Is there anything I can do? > A: Pull up that email with the activation keys that you received after purchasing the apps. You would just… (read more)

Undefined Variable Error After installing App

I installed the Business stats app and activated it perfectly. When I went to open it, it gave me a memory error and now says ” Undefined variable” ESC=Cancel and everytime I click it, it comes right back and won’t let me exit or do anything. I can’t get to the memory menu to clear… (read more)

Sum of converging telescoping series

How can the answer to this converging telescoping series be found on the 89 using the sequences and series module of calculus made easy ? Straightforward , under f2 C enter this series as 2/(n^2-1) with a starting value of N=2 Notice the series is undefined when n=1. Finally , your answer comes to be… (read more)

Business Statistics App

> Q: I was wondering if this app does one-tailed and two-tailed rejection region tests. > > > A: yes. It does that for all types of statistical tests, step by step. You may select at the levels too 5% , 1% etc

Green’s theorem

Q: I’m using the Green’s Theorem portion of the Calculus Made Easy app. It does not ask for the pathway etc… How do I enter the attached problem ? A: Here we go , enter as follows M,N = [y-x , 2x-y] Now lets think about the path for moment: it is an ellipse starting… (read more)

Memory Error when running Made Easy app

Hello I am having an issue running physics made easy. I keep getting a memory then an undefined variable error. This is on my calculator. Any ideas? Ans: Reason is very likely that your TI89s memory is filled up with preloaded apps . Here is the simple solution in 3 steps: 1. Backup your TI89… (read more)

Parametrization of a curve

Thanks, works perfectly for #6 where the function is simple [2y,2x] and the slope was simply 3t. I tried the exact same procedure on #7. however the function is now [8(4x+9),18(4x+9y)] and the slope is -1/6 from points (-9,4) to (3,2). I wonder if the variable bounds are [-9,3]? The book gives a solution of… (read more)

Finding sequence formulas and convergent/divergent sums

How do I do problems like finding the sequences formula or sums of convergent (OR IF IT DIVERSES)? Both problems can be solved using the Sequence and Series module in Calculus Made Easy using your trusty TI 89 . The Sequence Formula Finder under F1 4 will find formulas for geometric and arithmetic sequences. You… (read more)