what is the sum of the arithmetic sequence 3,9,15..., if there are 22 terms

Answer:The arithmetic sequence given above has a first term (a1) equal to 3 and the common difference (d) equal to 6. The sum of the first n terms of the sequence is calculated through  the equation,                                Sn = (n/ 2) x (2a1 + (n - 1) x d)Substituting,                                S22 = (22 / 2) x (2x3 + (22 - 1) x 6) = 1452Therefore, the answer is the first choice, 1452. Step-by-step explanation:Please mark brainliest and have a great day!