Melody

(the differrence in the prices ) divided by (the original price)  * 100  percent

You need to use brackets, I do not know what is divided by what.     

You solve inequalities the same as equations EXCEPT

you turn the sign around IF

1) you swap sides

2) you multiply or divide by a negative number

3) you take the reciprocal of both sides.  (turn them upside down)

That is it :)

http://forbrains.co.uk/free_online_tools/convert_to_roman_numerals?toroman=7000000#

I do not understand your question.  Sorry.

Thanks Alan that makes good sense :)

Hi Eloise,

Have you ever thought about why $${{\mathtt{7}}}^{{\mathtt{4}}}$$ is just 7 to the power of 4 BUT

$${{\mathtt{7}}}^{{\mathtt{2}}}$$  is not usually called 7 to the power of 2?    $${{\mathtt{7}}}^{{\mathtt{2}}}$$  is usually referred to as 7 squared.

$${{\mathtt{cm}}}^{{\mathtt{2}}}$$  literally means a square that is 1cm by 1cm big.

The area of a flat shap is the number of SQUARES that you can fit inside the shape.

So if a square has an area of 25 $${{\mathtt{cm}}}^{{\mathtt{2}}}$$   Then it must look like this.

You can count the little squares.  Each one is 1cm by 1cm in size so each one is 1cm^2

There are 25 of them.

the area of a square is Length x Length 

$$\\L * L = L^2\\\\
L^2=25\\\\
\sqrt{L^2}=\sqrt{25}\\\\
L=5 cm$$

2x(-3)x(-4)

You can do this in any order, the answer will be the same. :)

(-3)x(-4) = +12

2 x 12 = 24

or

2*(-3)=-6

-6*-4=24

The * is usually used instead of x on the computer so that it does not get confused with the letter x.

also

The brackets in this question are not necessary,  they don't have any real meaning :)

$$\boxed{(a-b)^2=a^2-2ab+b^2}\\\\
so\\\\
(\sqrt{x}-\sqrt{y})^2\\\\
=(\sqrt{x})^2\;-\;2\sqrt{x}\sqrt{y}\;+\;(\sqrt{y})^2\\\\
=x-2\sqrt{xy}+y\\\\
=x+y-2\sqrt{xy}\\\\$$

Ok Alan, thank you :)