Answer:
D
Step-by-step explanation:
You are expected to apply your knowledge of the real world to the given situations in order to identify whether the "rate of change" is constant. A constant rate of change means the dependent variable has a linear relationship to the independent variable.
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A
The independent variable is the outside temperature. The dependent variable is the number of people going to the beach. While the number of people going to the beach may increase as the temperature increases, the relationship is unlikely to be linear.
B
Points are scored unevenly during a ball game, so cannot be said to have a linear relationship with time played.
C
An acrobat flipping on a trampoline has increasing, then decreasing height. Height does not have a constant rate of change with respect to time.
D
If bananas are sold by the pound, then the price will be proportional to the weight of the bananas. The rate of change is the constant of proportionality: the price per pound. This situation has a constant rate of change.
