See a bracket – deal with it first!!
5(x + 2) = 15

To simplify surds like √50, you can split a surd
into its factors
When splitting, look for square numbers

To find a % increase, you must do
% increase = increase/original x 100
e.g. To increase from 7 to 12

To find equation of a straight line use
y = mx + c

To increase by 5%, multiply by ?

To decrease by 17% multiply by ?

If a surd is on the bottom of a fraction, get rid of it!!
If a surd is on the bottom such as √2, then
multiply top and bottom by √2

If given that after a 22% decrease something costs £5 then ...