Question

If f(x) is the total number of bacteria present in a sample after x hours , which of the following statements best describes the meaning of f(2)=12

A. The total number of bacteria present in a sample after 12 hours is 2.

B. The total number of bacteria present in the sample after 6 hours is 12.

C. The total number of bacteria present in the sample after 2 hours is 12.

D. The total number of bacteria present in the sample after 6 hours is 12.

Answer 1

The answer is A or C but I would go with C 

Answer 2

Answer: C. The total number of bacteria present in the sample after 2 hours is 12.

Explanation:

The given statement : f(x) is the total number of bacteria present in a sample after x hours.

It means the independent quantity = Number of hours

i.e. The independent variable in the given situation = x

Also, the dependent quantity = Total number of bacteria

i.e. The dependent variable in the given situation = f(x)

Therefore, the meaning of "f(2)=12" is the total number of bacteris present in sample is 12 after 2 hours.