Will you expect a positive, zero, or negative linear correlation between the two variables for each of

Question:

Will you expect a positive, zero, or negative linear correlation between the two variables for each of the following examples?
a. Grade of a student and hours spent studying
b. Incomes and entertainment expenditures of households
c. Ages of women and makeup expenses per month
d. Price of a computer and consumption of Coca-Cola
e. Price and consumption of wine