What is the mathematical formulation for 100 125 150 175 200 225 250 275 300?

The given sequence can be expressed mathematically as an arithmetic sequence, where the first term ( a = 100 ) and the common difference ( d = 25 ). The ( n )-th term of the sequence can be represented by the formula ( a_n = 100 + (n-1) \times 25 ). Thus, the terms can be calculated for ( n = 1, 2, 3, \ldots, 9 ).