Answer:
a) a demand curve
b) a demand schedule
Step-by-step explanation:
A demand curve is a graph that shows the relationship between price and quantity demanded.
A typical demand curve is downward sloping. This means that the higher the price, the lower the quantity demanded and the lower the price, the higher the quantity demanded.
A demand schedule is a table that shows the relationship between price and quantity demanded.
Attached is an image of a demand curve
I hope my answer helps you