Find the sum of the arithmetic sequence with first term 12 last term 90 and 14 terms give me the answer
Answer (1)
Answer:714Step-by-step explanation:The sum of n terms is given by: Sn = (n/2)(a + l)where S is the sum, n is the number of terms, a is the first term, and l is the last term.s = 14a = 12l = 90 S12 = (14/2)(12 + 90) S12 = (7)(102) S12 = 714 The sum, S, of the 14 terms, n, is 714
