Say whether each of the following changes will increase or decrease the equilibrium price and quantity, or

Question:

Say whether each of the following changes will increase or decrease the equilibrium price and quantity, or whether the effect cannot be predicted.
a. Demand increases; supply remains constant.
b. Supply increases; demand remains constant.
c. Demand decreases; supply remains constant.
d. Supply decreases; demand remains constant.
e. Demand increases; supply increases.
f. Demand decreases; supply decreases.
g. Demand increases; supply decreases.
h. Demand decreases; supply increases.