- There are 11 pens in a bag, 4 Green and 7 Blue. What is the probability of picking the same coloured pens? Answered by Laura H.
- (Economics A-level) Is the cross elasticity of demand for tea likely to be positive or negative following a rise in the price of milk? Explain your answer Answered by Dylan G.
- There are 11 pens in a box. 8 are black and 3 are red. Two pens are taken out at random without replacement. Work out the probability that the two pens are the same colour. Answered by Jack R.
- The equation of the line L1 is y=3x–2. The equation of the line L2 is 3y–9x+5=0. Show that these two lines are parallel. Answered by Dylan G.

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