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In Run/Mat screen, press the sequence [OPTN][F6:>][F4:NUMB][F1:ABS]. This will enter the abs( function on the command line. Complete its arguments (the expression inside the absolute value) and close the right parenthesis, then press EXE.
Hello, Turn calculator [ON]. If you do not see the menu icons, press [MENU]. Use the arrow keys to highlight the [GRAPH] icon. An entry screen appears where you enter the functions you want to graph. On the first line you have Y1= . After the equal sign enter 2[x] [X, theta,T] + 1. When finished press [F6: Draw] Your graph appears on the screen. If you see the axes, but no graph, press [Shift][V-Window] and press [F3:Std] then [SHIFT][QUIT] will take you back to the screen where you enter the functions to draw. There press [F6:Draw].
Sorry, this might not be much help but apparently the calculator is set in a mode called "base 10". I have never learned logrithms really in school, but did a little for my ACT. I figured that in order to do a problem, you need to divide. EXAMPLE: 8 log 2 = ? would be entered [log]  / [log]  [EXE] and the answer 3 will be displayed. Not much help, but maybe this will get you in the right direction.