Mr M's OCR (not OCR MEI) Core 1 Answers May 2015

Is it possible to drop 1/2 mark or do the examiners take away a mark?

Hi Mr M,
I don't think I put the y values for q6. how many marks would I loose?

Cheers

Probably just 1.

Hi Mr M

2iii. I wrote a squeeze parallel to the x axis by scale factor 1/3

3iii. I got my method right but I got a calculation wrong and ended up with 5^3!

How many marks do you think I will lose?

Hi Mr M

2iii. I wrote a squeeze parallel to the x axis by scale factor 1/3

3iii. I got my method right but I got a calculation wrong and ended up with 5^3!

How many marks do you think I will lose?

Is it possible you could send me the exam paper questions?

Mr M's OCR (not OCR MEI) Core 1 Answers May 2015


1. $4\sqrt3+4$ (3 marks)


2. (i) Curve in second and fourth quadrants (2 marks)

(ii) $y=\frac{1}{2-x}$ (2 marks)

(iii) Stretch parallel to y axis (or x axis) scale factor $\frac{1}{3}$ (2 marks)


3. (i) $5^8$ (1 mark)

(ii) $5^{-\frac{1}{4}}$ (2 marks)

(iii) $5^{\frac{9}{2}}$ (2 marks)


4. $x=27$ or $x=-8$ (5 marks)


5. (i) 5 (2 marks)

(ii) $6x-8y-29=0$ (7 marks)


6. $x=2$ and $y=1$ or $x=\frac{14}{3}$ and $y=-\frac{13}{3}$ (5 marks)


7. (a) $-3x^2+10x-3$ (4 marks)

(b) $-\frac{1}{48}$ (4 marks)


8. (i) U shaped parabola passing through $(-1, 0)$, $(0, -3)$ and $(\frac{3}{2}, 0)$ (4 marks)

(ii) $x<-1$ or $x>\frac{3}{2}$ (2 marks)

(iii) $k<-\frac{25}{8}$ (3 marks)


9. (i) $a=13$ (5 marks)

(ii) Minimum (2 marks)

(iii) $x=\frac{1}{3}$ (3 marks)


10. (i) Centre $(5, -2)$ and radius 5 (3 marks)

(ii) Show ... (5 marks)

(iii) 40 square units (4 marks)

will you be doing answers for the OCR C2 exam that was today?(20/05/2015) if so when uploading?

will you be doing answers for the OCR C2 exam that was today?(20/05/2015) if so when uploading?

I'll do it tomorrow evening. I don't see a paper for 24 hours.

If you want to see a question paper, ask your teacher. They are permitted to use the papers with you in your Centre.