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First of all you need to separate the two numbers 

you have 8Y

and 4y2

then ask yourself what you can divide both these 2 numbers with? so 4 can be divided by ...

The demand for a good which is elastic will react significantly to a change in price of a good. So if I was selling mars bars in a shop ( and mars bars were an elastic good) if I incre...

If you imagine that sin(x), cos(x), -sin(x) and -cos(x) are on a wheel as shown below:

      sin(x)

-cos(x)  cos(x)

     -sin(x)

then going clock...

Covalent bonds are formed when two atoms share one or more pairs of electrons. These atoms are non-metals, such as Carbon, Oxygen and Hydrogen.

Ionic bonds are formed when an atom gives o...

Ah! the famous auxiliary verbs. Here is a handy guide -

You use "avere" with ACTIVE TRANSITIVE verbs. Here is an example

Io HO mangiato - I have eat...