A streaming service charges $18 for the first month and increases the cost by $4 each month. Let \(a_n\) represent the cost of the \(n\)th month.   Which recursive rule models this situation?

Which description best identifies the sequence \(100, 50, 25, 12.5, \dots\)?

Find the sum of the first 15 terms of the arithmetic series 4 + 9 + 14 + …

A sequence is defined by \(a_n = 8(3)^{n-1}\).   What is the value of \(a_6\)?

A geometric sequence has \(f(1)=3\) and common ratio 5.   Find \(\sum_{n=1}^{7} f(n)\).

The following input–output pairs describe a sequence:   Data Table \(n\) 1 2 3 \(a_n\) 16 8 4   Which explicit rule represents this sequence?

A circle has endpoints of a diameter at \((-3,2)\) and \((5,2)\). What is its equation?

A bouncing ball’s rebound height is modeled by \(f(n) = 24\left(\frac{3}{4}\right)^{n-1}\).   Find the total height of the first 5 bounces.

A sequence is modeled by \(a_n = 1{,}200(0.85)^{n-1}\).   What is the value of \(a_4\)?

The table represents an arithmetic sequence:   Data Table \(n\) 1 2 3 4 \(a_n\) 6 10 14 18   Find the sum of the first 25 terms.