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Used for right angled triangles where c is the hypothenuse and a and b are the two other sides.

Equation: a² + b² = c²

Label the sides of th...

To solve the equation means to make x the subject i.e. to make x on its own. Therefore, we need to add 6. If you add 6 to one side you must also add 6 to the other side. 

x-6+6 = 15+6

Direct object pronouns take the place of nouns in writing. We use them to stop repeating ourselves. For example:

I have a book. I give the book to Juan a...

To form the perfect tense, you need two parts. The first part is known as the auxillary verb, which is either avere or essere. The second part is known as the past participle. So to say "I bought&...

The reaction is as follows:

2H₂ + O₂ -> 2H₂O

This means that for every 2 molecules of Hydrogen gas, one...