maths hlp 2 (mone hu** the me????)

[zed]

 

[nagaya]

a)P=1000*1.10*{16xy+5x^2}
b)V=0.5=x^2*y
y=0.5/x^2
so u can get P by x
then differentiate P by x and then dP/dx=0
then find x for min P