On a Uni Jetstream SXN-150 pen:



The method:
Pressing the Home Button and Power Button simultaneously
In optimization problem, we are always asked to find the value that will minimize/maximize.
Below are some tips in solving optimization problems which I found it quite useful:
These tips are extracted from http://www.math.ucdavis.edu/~kouba/CalcOneDIRECTORY/maxmindirectory/MaxMin.html. There are also a few examples given in the link.
Do check it out!
More often than not, I need to apply change of base formula in the field of Digital Logic Design.
The change of base formula is as follow:
logbx = logax / logab
where / denotes divide, and a = any integer for the base

Extracted from: http://www.wretch.cc/blog/cwwany/26692785