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Functional Question Higher (Algebra 4). For the week beginning …. Two gas supply companies have different ways of charging for the gas they supply. Common Mistakes – what did the examiners say?.
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Functional Question Higher (Algebra 4) For the week beginning ….
Two gas supply companies have different ways of charging for the gas they supply.
Common Mistakes – what did the examiners say? This question was intended to give students a choice of methods and as such was considered a ‘using and applying mathematics’ question. Graph paper was supplied in case a graphical method was adopted. Pleasingly, many different methods were seen, although the main method was Trial and Improvement or writing out tables of costs for each kwh. Graphs when used were usually correct. Algebra was rarely seen but a few candidates used a logical method based on the difference in cost of each kwh and the difference in costs of 5 kwh for both schemes. This was essentially the algebraic method without letters. The main errors were careless arithmetic. About half of candidates scored full marks.
