The answer is: This is a paradox, so we can't get any answer because if he is lying, then he's telling the truth, and vice versa.
$${\mathtt{1}}{\mathtt{\,\small\textbf+\,}}{\mathtt{1}} = {\sqrt{{\mathtt{4}}}} = {log}_{2}{\left({\mathtt{4}}\right)} = {\mathtt{2}}$$
Their GCF is 10:
$${\frac{{\mathtt{40}}}{{\mathtt{10}}}} = {\mathtt{4}}$$
$${\frac{{\mathtt{30}}}{{\mathtt{10}}}} = {\mathtt{3}}$$
It travelled π*radius*2*number of revolutions:
$${\mathtt{\pi}}{\mathtt{\,\times\,}}{\mathtt{23}}{\mathtt{\,\times\,}}{\mathtt{2}}{\mathtt{\,\times\,}}{\mathtt{72}} = {\mathtt{10\,404.954\: \!868\: \!689\: \!395\: \!205\: \!8}}$$
Unicorns don't exist. But if they did, purple Unicorns would be purple
For those who haven't understood, the miscalculation is on the penultimate line :
Since a²=ab, a²-ab=0;
And in the 9th line, I divided each side by a²-ab, so I divided by 0; and as you must now, the division by 0 is impossible.
Exactly. (-4)²=16 but -4²=-16, so -4²+5=-16+5=-11.
To enter a to the power of n, type a^n
$$\left\{ \begin{array}{l}{\mathtt{x}} = {\mathtt{1}}\\ {\mathtt{x}} = -{\mathtt{4}}\\ \end{array} \right\}$$
3+(-1)=3-1=2 not 4
+870 
