Edexcel A2 C4 Mathematics June 2015 - Official Thread

I put my calculator in degree mode for the population one and got 27 years i think, in radians it wouldv'e been too short of a time wouldn't it?

Do you guys think i can get an A* if I have 68-C3 67-C4.

How many marks do you think I will lose for the last question? I integrated the curve correctly, getting 40pi/ln3. But when calculating the volume of the cone I accidentally used (2-1/ln3) and did not use (2-(2-1/ln3)) for the height, so when I subtracted the 2 volumes, I got (67pi-54(pi)ln3)/ln3.

When u multiply out the bracket it becomes 9xln3 not 9ln3x so u then divide 18ln3 - 9 by 9ln3 to get 2-1/ln3

None if you got the right answer. It wasn't imperative that you changed it to 9^x. I personally left it as 3^2x, ended up doing a substitution somewhere along the way and it all worked out fairly quickly and nicely.

Thanks to MC1996

bump for those who couldn't find it

No it's not your fault for picking up on it, haha, you were only trying the defend the person. Well I was temporarily unable to count the words in my French essay at the end of that exam because I was shaking so much after 3hrs of stress... The invigilator came over and was like, "Do you need help counting?" I nearly died. I had a STEP exam right after as well... oh the irony.

no but i also got the wrong answer and im not sure why or how because i did 3^2x=1/ln3 3^2x

Anyone get 31.82 degrees for the angle in the vectors question???

Anyone get 31.82 degrees for the angle in the vectors question?

Yes.