Mr M&#x27;s OCR (not OCR MEI) Core 1 Answers May 2015

For (5root5)^3 i wrote 5^5.5 because i did 5^2 x 5^3 x5^0.5 rather that 5^1 x 5^3 x5^0.5. could i still get 1 mark

Reply 23

duncant

Hi Mr M, thanks a lot for posting the answers. Relative to the past OCR C1 papers, how difficult do you think it stands? Would you say it would have higher grade boundaries like June 2014 or lower, for example 58 for and A?

Reply 24

If one of my y co ordinate is wrog bu t my working from then on is fine will i get 2/4

Reply 25

Original post by ajamesg

Is there any chance you could post the c1 paper?

It is copyright so I can't.

Reply 26

Original post by Rubberduckiller

For attempting to work out the discriminant will you get a mark.

Yes.

Reply 27

Original post by czj1997

For question 7b)
I differentiated wrongly and ended up with a different power, and got the answer as -1/12. Do I get any marks?

Yes. You'll probably get 2.

Reply 28

Jords13

What was question 5ii) i cant remember the answer

Reply 29

Original post by Rubberduckiller

For (5root5)^3 i wrote 5^5.5 because i did 5^2 x 5^3 x5^0.5 rather that 5^1 x 5^3 x5^0.5. could i still get 1 mark

Possibly - I'm not sure.

Reply 30

Original post by Rubberduckiller

If one of my y co ordinate is wrog bu t my working from then on is fine will i get 2/4

On which question?

Reply 31

Original post by Mr M

On which question?

very last working out area of triangle

Reply 32

Original post by Jords13

What was question 5ii) i cant remember the answer

Find perpendicular bisector of (2,1) and (5,-3).

Reply 33

AstroNandos

For 7b, I got to the -1/16 * 1/3 stage where you get -1/48, but I decided to divide by 1/3 (no idea why?), so got -3/16. How many marks do you reckon I lost? Thanks :smile:

Reply 34

Original post by Rubberduckiller

very last working out area of triangle

Yes.

Reply 35

Original post by AstroNandos

For 7b, I got to the -1/16 * 1/3 stage where you get -1/48, but I decided to divide by 1/3 (no idea why?), so got -3/16. How many marks do you reckon I lost? Thanks :smile:

Just lose one.

Reply 36

Original post by Mr M

Yes.

cheers thnx alot for clearing my doubts

Reply 37

duncant

For the last question, I worked out the 3 co-ords but failed to work out the area of the triangle. Do you think I would lose 2 or 3 of the 4 marks?

Reply 38