Melody

I don't know.  Did you sell all of them?

If you did then the total revenue will be  120*2+290*3 dollars

Do you mean "What is the biggest cubic number that is smaller than 1440?"

Lets see

$${{\mathtt{1\,440}}}^{\left({\frac{{\mathtt{1}}}{{\mathtt{3}}}}\right)} = {\mathtt{11.292\: \!432\: \!346\: \!572\: \!34}}$$

$${{\mathtt{11}}}^{{\mathtt{3}}} = {\mathtt{1\,331}}$$

There you go, it is 1331

I am not usually any good at ferensic mathematics.  I have to take lessons of CPhil.

Did I do good???

Okay, thanks Alan.

$$\\a+\frac{b}{3}\\\\
=\frac{3a}{3}+\frac{b}{3}\\\\
=\frac{3a+b}{3}\\\\$$

Hi Alan and Olie96,

I just put this through Wolfram|Alpaha,

Great work Chris and Geno.

I'm going to hit it a different way.

$$\\\tan(\alpha+\beta)=\frac{tan\alpha+tan\beta}{1-tan\alpha tan\beta}\\\\
\tan(2x)=\frac{2tanx}{1-tan^2x}\\\\\\$$

so draw a right angled triangle and make one of the acute angles = 2x

the opposite side is $$2tanx=2*2=4$$

the adjacent side is $$1-tan^2x=1-2^2=1-4=-3$$    (the negative sign just means it will not be in the first quad )

Using pythagoras the hypotenuse will be

$$\\h=\sqrt{4^2+(-3)^2}\\
h=\sqrt{16+9}\\
h=\sqrt{25}\\
h=5\\$$

so

$$\\cos(2x)
=\frac{adj}{hyp}
=\frac{-3}{5}
=\;-0.6$$

$$\\x^3=x*x*x\\
$or if$\\
x^3=64\\
then\\
x=\sqrt[3]{64}=64^{1/3}=4\\
because\\
4*4*4=64$$

So the answser is 2 

I think the web2 calculator does this too.

example:

14 mod 3 means divide 14 by 3 and give only the remainder.

I entered it as

mod(14,3)

$${\mathtt{14}} \,{mod}\, {\mathtt{3}} = {\mathtt{2}}$$

the web2.0calc on the home page is pretty good too.