u have an arithmetic sequence with a common difference of 7.5
an = a1 + (n - 1) * d a1 = first term = 11.5 n = term to find = 48 d = common difference = 7.5 now it is just a matter of subbing a48 = 11.5 + (48 - 1) * 7.5 a48 = 11.5 + 47 * 7.5 a48 = 11.5 + 352.5 a48 = 364 <=== ur 48th term
