O-LevelMathematicsAlgebra and graphs4024/11 · May/June 2021 · Q238 Marks
a = b²+c / d
- (a)(i)Find a when b = 4× 10², c = 6×10³ and d = 2×10². Write your answer in standard form.[3]
- (a)(ii)Rearrange the formula to make b the subject.[3]
- (b)m×10⁴+m× 10² = 36 360 Work out m×10⁴ -m × 10².[2]
Mark scheme
Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.
- [3] (a)(i) 8.3 × 10² cao
- M2 for answer figs 83
- M1 for figs 166 seen
- M1 for 8×10² +3×10¹
- [3] (a)(ii) b = [±] √ad - c final answer
- M1 for correct first step
- M1 FT for isolation of b²
- M1 FT for square root taken
- [2] (b) 35 640
- M1 for m = 3.6 soi
- M1 for 36360 / 10100
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