An arithmetic sequence has its first term as 5 and a common difference of 3. What is the sum of the first 10 terms of this sequence?

✓ Correct Answer: Option A

The first term (a1) is 5, and the common difference (d) is 3. The 10th term (a10) = 5 + (10-1)*3 = 32. The sum S_10 = 10/2 * (5 + 32) = 5 * 37 = 185.