Question

p varies directly as q and inversely as r if p = 4, p = 1 and r = 2 find p in terms of q and r

Answer 1

p = kq/r
Assuming you meant p=4,q=1,r=2, that means
4 = k*1/2
So, k=8, and
p = 8q/r

Answer 2

give me answer

Answer 3

How rude, Luka. =(