Answer:
(d) is correct
Equilibrium quantity is 4.5
Equilibrium price is 5
Explanation:
Given
-- supply
-- demand
Required
Find the equilibrium price
Equilibrium price is when:

This means that (d) is correct
So, we have:


Collect Like Terms


Multiply both sides by 2


Take the square root of both sides


-- approximated
The equilibrium price is:

Substitute value for q^2

