Final answer:
A mathematical quantity is made up of a number and a unit, such as 'two dozen eggs' where 'two' is the number and 'dozen eggs' is the unit. The zip code of a city is an example of a quantifiable factor as it can be numerically measured.
Step-by-step explanation:
A quantity in mathematics is composed of two parts: a number and a unit. When we say two dozen eggs, the number is two and the unit is dozen eggs. The phrase two dozen represents the number 24 and when combined with the unit 'eggs', it defines the quantity. Similarly, quantities like '88 meters per second' and '3.5 grams of gold' express speed and mass, respectively, with 'meters per second' and 'grams' being the units.
To address the multiple choice question on quantifiable factors, option B, the zip code of your city, is quantifiable as it represents a numeric code that can be measured and compared. Student motivation, on the other hand, is more difficult to quantify, as it is subjective and can vary greatly among individuals.