Economics Maths Questions iii

a) http://i238.photobucket.com/albums/ff245/chocolate328154/Eco002.jpg
A fall in the price of other fruits causes the demand for oranges to drop from D to D1 as oranges and other fruits are of competitive demand.
Both equilibrium price ( P to P1 ) and quantity ( Q to Q1 ) drop.
b) http://i238.photobucket.com/albums/ff245/chocolate328154/Econ006-1.jpg
A rise in demand for orange juice increases the demand for oranges from D to D1, as they are of derived demand.
Both equilibrium price ( P to P1 ) and quantity ( Q to Q1 ) rise.
c) http://i238.photobucket.com/albums/ff245/chocolate328154/Eco002.jpg
When consumers expect the price of orange to fall next week, the demand for oranges decreases from D to D1, as they postpone their purchases.
Both equilibrium price ( P to P1 ) and quantity ( Q to Q1 ) drop.
d) This will cause both increase in demand and supply. However, as the magnitude of increase is uncertain, there are 3 possibilities:
1) If demand increases more than supply, both equilibrium price and quantity rise.
2) If demand increases the same as supply, equilibrium price remains unchanged while the quantity increases.
3) If demand increases less than supply, equilibrium price drops while the quantity increases.