Question

Q.4 plz, all of them..full explanation thanks! :)

Answer 1

i) when P = 2, Q= 0.25 = 1/4
reciprocal of 2= 1/2 
in order to get to 1/4, you need to multiply this value by 1/2.

Therefore, Q= 1/2P

ii) when P=5
Q=1/2*5
=1/10= 0.1

iii)0.2=1/2P
0.4P=1
P=1/0.4
=2.5 or 5/2