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If £160 = 100%, the number we are trying to find (let's call this X) equals 145%. (Place numbers in 2x2 grid) 100%    £160 145%     X Multiply the two diagonal numbers together, then divide by the number ...

• The behaviour of the solution depends on the value of the discriminant, D = b² – 4ac, (aptly named as it allows you to discriminate between solutions)

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(I assume I can use the whiteboard in an actual lesson/interview)

So this question might seem quite simple, and maybe it is, but this type of question can catch many students out. The first step is...

1. Collect like terms 2x - x +6y +2y 2. Simplify like terms 2x - x = x 6y+2y=8y 3. Write final answer x + 8y

We would first like to work out the size of all the angles which have not been give, as one angle is 140 degrees we know the angle opposite to it is also 140 degrees due to the symetry of the shape. The t...