How do I get the n/d function off my ti-15?

Not directly. The calculator does not have the trig functions built in. You could do it the same way people did it before pocket calculators.

Not directly. The calculator does not have the trig functions built in. You could do it the same way people did it before pocket calculators, but you can't do it just be pushing one or two keys on this calculator.

It's in the MATH NUMBER menu. To calculate 14 mod 15, press
2ND [MATH] 1 9 1 4 , 1 5 ) ENTER

On this family of calculators, you do as follows

1. Enter the first number (degrees), ex:15
2. Press [2nd][APPS] (ANGLE) to access the Angle functions
3. Select [1: degree symbol] [ENTER]
4. Main screen shows 15 deg
5. Enter the minutes, ex 25
6. Press [2nd] [APPS](ANGLE) to access Angle functions
7. Select [2:' apostrophe] [ENTER]
8. Screen echoes 15 deg 25'
9. Enter the seconds number, ex 32
10. Press [ALPHA][+] (") to access the double quotation mark.
11. Screen echoes 15 deg 25' 32"
12. Press [ENTER]
13. Calculator converts this in decimal degrees 15.42555556
    

To convert this back to DMS, press [ANGLE][|=>DMS][ENTER] and the calculator displays the original value 15 deg 25' 32"

clear the memory

I noticed that this calculator doesn't have a natural logarithm function as well. You can can always use the fact that
ln x = (log x) /log e or since log e is approximately .43429482
ln x = (log x)/.43429482. The greatest solution and it might be worth the 15 bucks or so to get a calculator with e^x and the natural logarithm function.

type 15 then click a button that looks like this^. then 365. Then hit enter. it is like a normal clcutor except with more function. Sometimes you need to use the 2nd and the alpha button to do some functions.

Hello,
You should enter it as follows [SQRT]36 ) [ENTER/=].
If you define some function f of a variable x you write that f(x), where the parentheses enclose the so-called argument (objet on wich the function acts). It seems that on this calculator the opening parenthesis is implicit: the calculator supplies it when you press [SQRT] but does not display it (a design flaw?). However the closing parenthesis must be entered by you to signifie to the function [SQRT] that you have finished entering the argument. Weird but one can live with it.
Hope it helps.

The greatest integer function (also called a step function) is actually a piecewise defined function with a special definition. The function has the notation f(x)=||x|| or f(x)=[[x]] when it is written, but the TI-83 and the TI-84 designate this function by using f(x)=int(x) and is found in the MATH NUM menu. This function is the greatest integer less than or equal to x. So, f(1)=1 and f(1.4)=1. Since this is a piece-wise function you should use DOT mode.

How do I clear off fix (rounding) mode on the TI-10 and TI-15?

In order to clear Fix off the calculator just press the following keys
- First press the [Fix] key
- Next press the [.] decimal key