Pearson Edexcel International GCSE Mathematics B Paper 2

Instructions • Use black ink or ball-point pen. • Fill in the boxes at the top of this page with your name, • centre Answer number all questions. and candidate number. • Answer the questions in the spaces provided • – Calculators there may be may more be space used. than you need. Information • The total mark for this paper is 100. • The marks for each question are shown in brackets – use this as a guide as to how much time to spend on each question. Advice • Read each question carefully before you start to answer it. • Check your answers if you have time at the end. • Without sufficient working, correct answers may be awarded no marks. Answer ALL TWELVE questions. Write your answers in the spaces provided. You must write down all the stages in your working. 1 The following formula can be used to change a temperature f degrees Fahrenheit to a temperature c degrees Celsius. 5( f − 32 ) c = 9 5 ( f − 32) (a) Make f the subject of c = 9 (3) Sean and Kate measure the temperature of a heated iron bar. Sean measures the temperature of the iron bar as x degrees Fahrenheit. Kate measures the temperature of the iron bar as y degrees Celsius. Given that x = 2y , (b) find the temperature, in degrees Fahrenheit, of the iron bar. 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