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The area of a triangle is the (1/2) x (base x the height).

The main methods of differentiation you need to know at A level are the chain rule, the product rule and the quotient rule.

The chain rule should be used when the eqation is a function of...

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

The ratio of 3:1 involves 4 units. 3 men +1 woman.

Find how many people each unit represents:

     4units        2476 people

Therefore each unit represents 247...