Melody

250 what?

and what is the rate of what? 

192*1/3

=192 divided by 3

you  can do it on the calc on the home page.

(3+2sqrt(2)^2=?

There is a bracket missing

(3+2sqrt(2))^2

$$\\=3^2+(2\sqrt2)^2+2*3*2\sqrt2\\\\
=9+4*2+12\sqrt2\\\\
=17+12\sqrt2\\\\$$

$$\\\frac{1}{3}(x-2)\times 9\\
=\frac{1}{\not{3}}(x-2)\times \not{9}3\\
=3(x-2)
=3x-6$$

[2nd]     top left corner 

Do you mean 12% OF $115 ?

12/100*115

3 apples divided between 1 person.  How many apples will that person get?

over is the same as divide 

the radius is the distance from the centre of the circle to the edge (or circumference ) of the circle.

And yes, as CPhill said, it is half the diametre.   

Thanks Chris 

It is always good to get a couple of different takes  

No Shaniab - that is an estimate for pi

pie is definitely a pastry.