Paper 3 May/June 2010 MATHEMATICS (9709/32) A Levels
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

A biologist is investigating the spread of a weed in a particular region. At time $t$ weeks after the start of the investigation, the area covered by the weed is $A{\text{ }}{m^2}$. The biologist claims that the rate of increase of $A$ is proportional to $\surd \left( {2A - 5} \right)$.
a) Write down a differential equation representing the biologist’s claim.
b) At the start of the investigation, the area covered by the weed was $7{\text{ }}{m^2}$ and,…