it means that the change does not depend on the amount already present. The amount changes by a constant amount each time period. That is, a fixed amount per year, per day, etc.
So, what do you think?
Grisham is considering the three situations below.
I. For the first 28 days, a sunflower grows at a rate of 3.5 cm per day.
II. The value of a car depreciates at a rate of 15% per year after it is purchased.
III. The amount of bacteria in a culture triples every 2 days during an experiment.
Which of the statements describe a situation with a equal difference over an equal interval?
(1) I, only
(2) II, only
(3) I and III
(4) II and III
I don't understand what it means by "equal difference over an equal interval".
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