Answer:
Quantitative: Age, heart rate, number of pets, salary
discrete: number of pets
continuous: Age, heart rate, salary
Categorical: Gender, eye color, metal rankings
Nominal: Gender, eye color
Ordinal: metal rankings
Explanation:
Quantitative are those variables which are for quantity or number with units for measurement.
Categorical are qualitative variable which can be categorized or grouped in different groups or it may be ranking scales