Final answer:
a. Exponential growth, b. Exponential decay, c. Constant
Step-by-step explanation:
a. The number of foxes in a park doubles every year. This is an example of exponential growth. As time progresses, the number of foxes increases at an exponentially increasing rate.
b. The number of players in a tournament goes down by half every round. This is an example of exponential decay. As the number of rounds increases, the number of players decreases at an exponentially decreasing rate.
c. f(x)=7. This is an example of a constant function. The value of f(x) is always 7, regardless of the input value.