User Guide –
Economics Made Easy
Topic 
Description 
Correct 
Incorrect 



1)
General usage of the TI89/Voyage200 
a)
Multiplication of variables b)
Enter .5 instead of ˝ to obtain decimal answers. c)
Roots: i.e. ^{3}√x d)
Denominators e) Squaring sin(x) f)
Attention to parentheses: g)
Euler Number h)
Parentheses 
x*y^2, x*cos(x) use ˝*x or .5*x x^(1/3) 1/(x2) sin(x)^2 I.e. ln(sin(5x))/(x^21) (x^29)/(3+x^2) 
xy^2, xcos(x) 3√x 1/x2 sin(x^2)
(x^29)/3+x^2 



2)
General usage of EME 
a) Use
ESC to exit the current module or EME altogether. b)
Incorrect Entries – see above  yield the error message: “Invalid Entry”.
Press ENTER and correct expression. c) To
force decimal answers, use decimal input (see also 1b) d)
Provide 100,000 of RAM and 100,000 of Flash ROM (to check:2^{nd}
6). Deleting or archiving files may be necessary: use 2^{nd} “–“ (VARLINK), F4 to select files, then F1 to delete or
archive. Archiving might be a good way to manage programs, variables, etc as
a loss of battery power may delete any unarchived files. e)
Emptying the MAIN folder when starting EME will prevent any file
reoccurrences (and thus loading error). f)
Should EME not start (anymore) or act strange, reset ALL memory (2^{nd}
6, then F1) as memory may be corrupted.
g) Use
the latest Operating System (OS) using TI Connect. 




















