3c. Read what Zara says: 3⁰ + 3¹ + 3² + 3³ = 3⁴ − 1.

Check each side: 3⁰ + 3¹ + 3² + 3³ = 1 + 3 + 9 + 27 = 40, and 3⁴ − 1 = 81 − 1 = 80. They are not equal, so Zara’s statement is incorrect. The matching expression is 3⁰ + 3¹ + 3² + 3³ = (3⁴ − 1) ÷ (3 − 1) = 40.