Alan

You can estimate the square root of a number n by iterating the expression (1/2)(n+2/n).  That is, you get the first estimate by n1 = (1/2)(n+2/n), then the second, better, estimate by n2 = (1/2)(n1+2/n1), then the third estimate by n3 = (1/2)(n2+2/n2) and so on.  However, you will probably still need a calculator to do these calculations!!

The volume of a cylinder is given by pi*r^2*h where r is the radius and h is the height.  So pi*2^2*h = 100

therefore h = 100/(pi*4) cm or

 $${\mathtt{h}} = {\frac{{\mathtt{100}}}{\left({\mathtt{\pi}}{\mathtt{\,\times\,}}{\mathtt{4}}\right)}} = {\mathtt{h}} = {\mathtt{7.957\: \!747\: \!154\: \!594\: \!766\: \!8}}$$

Pres the key marked 2nd

Clearing the mind of what?

If you mean on the site calculator, just type in your equation, for exampe 2x + 1 = and then press enter or click on the calculator's equals sign.

There are two sideband frequencies; one at fc+fm (fm is message frequency) and one at fc-fm, in addition to the carrier frequency, fc, itself.

The scientific calculator on the Home page isn't working!

Although the questions are ordered latest first the answers aren't.  This is annoying when the thread is very long (e.g. End of day wrap).  Previously we could choose to go in at either the first or the last post in a thread.

If it's a regular polygon, then each interior angle is 180°-360°/11 so the sum of 11 of them is 11*(180°-360°/11) = 11*180°-360° = 1620°

Each of the 6 teams plays 5 others so at first sight it looks as though there are 6*5 = 30 matches.  However, this counts each match twice, so, in fact, there are 30/2 or 15 matches in total.