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O-LevelMathematicsTrigonometry4024/11 · Oct/Nov 2015 · Q83 Marks

cos y° = -0.54 where 90 < y < 180 One solution of the equation cos x° = 0.54 is x = 57, correct to the nearest whole number. Find y correct to the nearest whole number.

  1. (a)cos y° = -0.54 where 90 < y < 180 One solution of the equation cos x° = 0.54 is x = 57, correct to the nearest whole number. Find y correct to the nearest whole number.[1]
  2. (b)Solve (5a - 2) / 3 = 11.[2]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2015). The mark or mark type is shown in brackets.

  1. [1] (a) 123
  2. [2] (b) 7 WWW
  3. [2] M1 for 5a - 2 = 33 oe

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About this question

Topic
Trigonometry, O-Level Mathematics (syllabus 4024). Structured question, 3 marks.
Source
O-Level Mathematics, Oct/Nov 2015 Paper 1 Variant 1, question 8.

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