Answer:
3
Step-by-step explanation:
The common ratio here is 3. Note that 4 is the first term of this sequence, and that n is the index: first term, second term, etc.
Every term is found by mult. the previous term by 3.
8π²
2πr² is the equation to find the base, but the answer doesn't ask for the exact awsner, rather the expanded version. 4 is the radius, radius x 2 is 8.
8π²
The output is
n - 5 × 4 = 4(n - 5)
