How do you input arccos(5/10) in the ti 30x IIS model

You will find the description of all potential errors in the manual.

For the 30Xa you may download the manual (TI calls it a guidebook) from here. TI doesn't have a guidebook for the 30X IIS, but you can get the quick-ref and teacher's guide from here.

You don't. The 30X IIs runs on both solar power and a 2025 lithium battery. If you need to replace the 2025 battery, see this.

Press the key that is marked with a small circle, an apostrophe, and a double quotation mark. That is the DMS key. You can use it to convert from Decimal degress to DMS and back.

try this:
www.staples.com/Texas-Instruments-TI-30X-IIS-Scientific.
Notice that the S-model is scientific.
I will bet that the B-model is aimed at business applications.
Good luck.

The following examples will demonstrate how to convert decimals into fractions using the TI-30Xa and TI-30Xa Solar. Please be aware that TI-30Xa Solar School Edition calculators do not have this functionality.

Example: Convert .25 to 1/4
- Input .25, press [2nd][<--] (says F<>D above it).

** F<>D means fraction to decimal, decimal to fraction.

Example: Convert 1.38 to 1_19/50

- Input 1.38, press [2nd][<--].

Example: Convert 9.75 to 9_3/4

- Input 9.75, press [2nd]{<--].

You must enter 100+10%100 or 100+10%(100). This will give you the correct answer of 110.

Hi,

You can download the required manual from:

http://education.ti.com/educationportal/sites/US/productDetail/us_ti30x_iis.html?bid=6

Hope this solves your problem. For more help and clarifications, please reply to this post. Thanks

if you want to use your calc for this you would have to put it in as the operations to change the mixed to improper fraction i.e. input exactly as "((8*3)+6)*((3*7)+1)="  remember?  take denominator times whole number plus numerator and put over denominator to convert from mixed to improper... hope this helps

Press any key (except for 2nd and On), and the message should disappear.