Work on the following questions for tomorrow’s class. You don’t need to complete all of these, but try to complete at least one from each section.
Exercise 9B.2 1d, 2b, 6, 10, 11, 12B
Exercise 9B.3 2ab, 3
Also, make sure you see the updated test information here.
Challenge Question: Prove that an arithmetic sequence with first term \(a_1\) and common difference \(d\) is such that
\[S_n=\frac{n}{2}\left(2a_1+(n-1)d\right)\]