Given the following two functions. qa=50+p. qb=200-4p. (a) identify which is the supply function of demand function(b) what is the is equilibrium price of the quantity(c) what is the price elasticity of supply for this

(A) The supply function generally is considered to have positive slope. Qa has positive slope. Qb has negative slope, so is probably the demand function.
  supply function: Qa
  demand function: Qb

(B) The equilibrium price is the price that makes supply equal to demand.
  Qa = Qb
  50 +p = 200 -4p
  5p = 150
  p = 30
The equilibrium price is 30.

(C) The price elasticity of supply is computed as
  Es = (dQa/dp)·(P/Qa) = 1·p/(50+p)
  Es = p/(50+p)

At p=30, the numerical value is Es = 30/80 = 3/8. Qualitatively, the supply is inelastic.

The correct answer is b, social stratification is needed for a society to exist. marxist theory regarding social stratification is that due to the differing economic capacities among people in society, a natural separation occurs between those that own the means of production and those that sell their labour in the production chain. 

C. precise