Answer:
The given sequence has a common difference of 1. So, we can write the explicit formula as:a_n = a_1 + (n-1)dwhere a_1 is the first term, d is the common difference, and n is the term number.Here, a_1 = 8 and d = 1. Substituting these values, we get:a_n = 8 + (n-1)1
a_n = n + 7To find the twentieth term, we substitute n = 20 in the formula:a_20 = 20 + 7
a_20 = 27So, the twentieth term is 27.Simplifying both answers, we get:a_n = n + 7a_20 = 27