## Archive for May, 2015

### Step by Step Unit Converter

Wednesday, May 13th, 2015

Do you know that our Step by Step Unit Converter atÂ http://www.ti89.com/?a=UNITC

can do ANY Physics, Math, Money , Motion, Dimension type conversions? Try it free!

### Comparison test for convergence

Tuesday, May 12th, 2015

> Q Is there any way that I can use comparison test in calculus made easy app?

A : No. That’s because it is difficult for the app to figure out the comparison series. So it is just listed here.

### Run TI89 apps on Android phones

Tuesday, May 12th, 2015

Our TI 89 apps run wonderfully on Android cell phones.

Your android TI89 app need their own activation keys.
Please check for the calc ID under F1 -> About. Only the paid Ti89 emulator comes with an ID which is needed to run our TI 89 made easy apps.

### Chemistry Made Easy balances chemical equations step-by-step

Monday, May 11th, 2015

Do you know that Chemistry Made Easy on the TI 89 calculator can balance equations step-by-step?
Just plug in any chemical equation and see how the app uses the included periodic system of element information to
balance that equation for each element. See some examples here http://www.ti89.com/chme/index_chme.htm

Step-by-Step Solutions on your TI89 in Math & Science & Finance.

### Series Solutions to 2nd order Differential Equations

Monday, May 11th, 2015

Q: I see a Series Solution under F2: 2nd order on the Differential Equations Made Easy app but how do i use it?
I love the apps by the way,
Thank you very much. Differential Equations Made Easy, Calculus Made Easy and a couple others have been extremely helpful.Thanks!

A: Under F2 C you can find Series Solutions to 2nd order Differential Equations on the TI89. Just enter the 3 coefficients on the left and the one on the right right side.
EX:
1
0
1
0

Next enter your desired degree , such as 5, next press ENTER a few times to view solution, notice the highest order term is displayed first , then in decreasing order.

### How to find Interval and Radius of Convergence on the TI89?

Thursday, May 7th, 2015

> What about the 2 power series problems in the pictures ?

A: you can view the step by step solutions to find both the interval and radius of convergence of any power series under F3 1 within the sequence and series module of calculus made easy.

When entering both power series you will see that first the interval of convergence IOC is computed using the ratio test on the given nth terms , secondly the endpoints are evaluated separately and lastly the radius R of convergence is computed from the IOC.

Everything in step by step fashion yielding R=1 and IOC -1 to 1 exclusive endpoints.

### How to type in factorial ?

Tuesday, May 5th, 2015

For example n/n! to check for converging and diverging series .

A: The factorial symbol ! on the TI89 can be found under CATALOG , which is where all symbols and commands can be found .

### Can Stats Made Easy calculate the P-Value if you just give it a Z-score?

Sunday, May 3rd, 2015

with ease:
Go to Normal Distribution under F3 ,
mu=0
sigma = 1
a=-2.12

Dropdown select option 2 P(X>=a)

That simple.

### How do you check convergence of 1 / ( n * ln(n)) in the p-series test

Sunday, May 3rd, 2015

You don’t use the p-series test as that test only applies to terms of format 1/n^p , the extra ln(n) term means to use a different test .

That’s why we created the amazing all-in-one series convergence tester under F2 7 : Enter your series as
1 / ( n * ln(n) ) to learn that it diverges by the integral test : Since the corresponding integral diverges , this series diverges.

### integral test

Saturday, May 2nd, 2015

> Q: how to enter this 1/n * ln(n)^p in the integral test? A: p needs to have a value, dont write p. make sure to use ( ) for your denominator,
Ex: 1/( n * ln(n)^2)