exam Maths Puzzle Numerical Ability

A ball is thrown upward from the roof of a building 100 m tall with an initial velocity of 20 m/s. When will the ball reach a height of 80 m?

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320ml of 30% alcohol soln, convert this to 50% alcohol soln by adding 70% alcohol soln. For given vectors u = (2,0,3), v = (-1,4,2), let points A, B, P and Q have position vectors 3v - u, 4v, 2u + v, (4,8,13) respectively. Show that ABQP forms a parallelogram (NB not