Question 7 • Advanced Financial Algebra
The sequence starts with 30 photos and decreases by 5 each day, so its first term is 30 and its common difference is −5. Using the arithmetic-sequence formula aₙ = a₁ + d(n − 1), we get aₙ = 30 − 5(n − 1). This is choice B, an = 30 − 5(n − 1).
AI-written and checked against the verified answer.