Answers and Step-by-step explanation:
a. The independent variable is the variable being manually changed by the experimenter. The dependent variable is the variable being affected by the independent variable. X (members joining the fitness club) is the independent variable. Y (total monthly cost) is the dependent variable.
b. The domain is 6, because x is always the domain. The range is 77, because Y is always the range. You plug in 6 (the domain which is x), and get 77.
c. Yes, this relation is a function. Relations are only not functions when one singular input (domain) goes to 2 outputs (range).
A domain can not have multiple ranges. A range can have multiple domains though.