2 p varies directly as q and the square of r and inversely as s.
a. Write the equation of the relation.
b. Find kif p = 40 when q = 5, r = 4 and s = 6.
c. Find p when q = 8, r= 6 and s= 9.
d. Finds when p= 10, q=5 and r = 2.