The quantity of coffee demanded, Q^d, depends on the price of coffee, P_c, and the price of tea, P_T. The quantity of coffee supplied, Q^s, depends on the price of coffee, P_c, and the price of electricity, P_E, according to the following equation:

Q^d = 17 - 2P_c + 10P_T

Q^s = 2 + 3P_c - 5P_E

a. If the price of tea is $1.00 and the price of electricity is $0.50, what are the equilibrium price and quantity of coffee?

b. What is/are the endogenous variable(s) in this model?

c. What is/are the exogenous variable(s) in this model?