5 Calculate S for the sequence defined by { an} = 1+ -n O A. 13.5 O B. 23 O C. 40 O D. 42.5Which equation should be used to calculate S, for the arithmetic sequence a, = 3n-1? O A. So = (2+26) O B. SQ = (4+17 ) 9 O C. SQ = -(2+26) 4 O D. SQ = (4+26) 4N - Find the 10th partial sum of the arithmetic sequence defined by {a,} = NI O A. 4.5 O B. 20 O C. 22.5 O D. 27\fCalculate the sum of the first 36 terms of the arithmetic sequence in which a36 = 14 and the common difference is d = 8 O A. 425.25 O B. 850.5 O C. 423 O D. 846