## Newb with a TI-npire CX CAS

I'm taking an online "Elementary Algebra" class from my local community college. It's been a few years since I graduated high school and I've forgotten pretty much everything; including my T-84 Silver, which I never took full advantage of its potential anyway.

So I went out and got myself a new calculator, and for some reason I got the nicest one available; the TI-nspire CX CAS and I am utterly lost. Please excuse my ignorance, I'm about to ask some extremely stupid questions:

First of all, how you divide?!?! When I try, it gives me the answer as a reduced, improper fraction. How can I convert that to a decimal? Or is there a setting I can change to do it automatically.

Similarly, how do I add/subtract/multiply/divide fractions on it? To make the line between the numerator and the denominator is it just the ÷ key?

Also, I see that there is an "=" button that doesn't actually solve math problems, like the Enter button does. This leads me to believe I can enter entire equations and have the calculator solve for x. Is this true? And if so, how do I accomplish that?

Finally, will it/how do I get it to do fractional proportions? For example, what buttons would I press to solve this:

x = _ 5
9 ** 4
(ignore the asterisks...I can't make them go away....)

I apologize for the many stupid questions, thanks in advanced for the help!

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 Thanks! You answered all my questions. This is going to make this class an absolute breeze. I need to make sure I actually learn the math and not just let the calc do all the work though, lol.

## Newb with a TI-npire CX CAS

I am also a newb on the Nxpire cx cas. Can someone explain to me how to use pi on this calculator? Everytime I try to use it, for example, multiply to add or subtract with pi it gives me an error. Anyone? thanks

 Hey-I just got my TI inspire CX, how do I change the settings so that it will give me answers in simplified radical form? For instance, if I input square root of 12 I want to get 2 times the square root of 3, but I get 3.41... instead. Also, I want it to give me answers in terms of pi, not in decimals. My old TI inspire did this, help? Anyone?

 Quote by EmilyJoy Hey-I just got my TI inspire CX, how do I change the settings so that it will give me answers in simplified radical form? For instance, if I input square root of 12 I want to get 2 times the square root of 3, but I get 3.41... instead. Also, I want it to give me answers in terms of pi, not in decimals. My old TI inspire did this, help? Anyone?
It sounds like it is in "Approximate Mode" and you want to get it into "Exact Mode."

If you have the manual you can probably look up Mode in the index.

This description
http://mathbits.com/mathbits/TINSect...eral/Mode.html
might be close enough that you can use it to select Exact Mode and you may also want to do as it describes at the bottom to make that Exact system-wide so it applies to everything you work on.

If you ever need to get back to decimals you follow the same directions and choose Approximate.