OCR MEI C1 — Question 1 2 marks

Exam BoardOCR MEI
ModuleC1 (Core Mathematics 1)
Marks2
PaperDownload PDF ↗
Mark schemeDownload PDF ↗
TopicIndices and Surds
TypeSolve power equations
DifficultyEasy -1.8 This is a straightforward rearrangement requiring only basic algebraic manipulation (divide by π(x+y), then take the positive square root). It's a routine C1 exercise with minimal steps and no problem-solving required, making it significantly easier than average A-level questions.
Spec1.02a Indices: laws of indices for rational exponents
Make \(r\) the subject of the formula \(A = \pi r^2(x+y)\), where \(r > 0\). [2]
Question 1:
AnswerMarks
1A A
[r] or [r] as final
x y xy
AnswerMarks
answer2
[2]square root symbol must extend below
fraction line; accept to power ½ with
appropriate brackets
M1 for a triple decker fraction or for
A A
r2  or for [r]
x y x y
AnswerMarks
or for their final answer for r ft their r2condone missing end bracket in
denominator
A
eg M1 for [r]
x y
Question 1:
1 | A A
[r] or [r] as final
x y xy
answer | 2
[2] | square root symbol must extend below
fraction line; accept to power ½ with
appropriate brackets
M1 for a triple decker fraction or for
A A
r2  or for [r]
x y x y
or for their final answer for r ft their r2 | condone missing end bracket in
denominator
A
eg M1 for [r]

x y
Make $r$ the subject of the formula $A = \pi r^2(x+y)$, where $r > 0$. [2]

\hfill \mbox{\textit{OCR MEI C1  Q1 [2]}}
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Q1 2 Q2 5 Q3 12 Q4 4 Q5 4 Q6 5 Q7 3 Q8 4 Q9 4 Q10 3 Q11 3