How do you work this out?
Mark scheme is giving me a headache.
Past paper question Watch
- Thread Starter
Last edited by Silentscar97; 13-01-2015 at 17:19. Reason: Forgot to add picture
- 13-01-2015 17:17
- 13-01-2015 18:37
Well I think you measure the whole length of XY then measure the length from the edge to the end of the plaque build up...
(XY) minus (Length of plaque accumulation)/(XY)
and I am assuming this is to be measured in cm/mm as it says to use a ruler and does not ask for it as a percentage. Hope this is in some way useful