Part B(ii) - Interpret in Context
For "interpret" questions: Use the word "increase" or the word "decrease" to show you understand what a positive or negative rate of change implies. Pair this word with a positive rate of change. Your interpretation should sound like you're describing what 𝑑 does in an arithmetic sequence. E.g. "From 2002 to 2010, each increase in year corresponded with an increase of $20 in revenue on average."