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Fractions can be easily understood by thinking of how to split n numbers of pizzas between d people. Through this we see that everyone gets (n/d) pizzas

Rearrange to get either y or x as the subject of the equation and then solve the equation by doing this. This is called eliminating one variable (x or y) substitute the found value into either equation st...

-((3x+2)(1+sqrt(x)))/(1-x)

The gradient of the perpendicular line is the negative reciprocal of the gradient of the original line. For example if the gradient of the original line is 4, the gradient of the perpendicular line is -1/...

Pythagoras' Theorem can only be used on right angle triangles. To find the length of side a, the theorem can be used as follows:
a²=h²-b²
Taking the square root ...