Find 25th term of sequence the following 0.3, 0.9, 1.5, 2.1

Answer 1

.9-.3 = .6
1.5 - .9 = .6
2.1 - 1.5 = .6
looks like an arithmetic sequence to me
a = 0.3
d = 0.6
term n = a +(n-1) d
term 25 = 0.3 + 24 * 0.6

Answer 2

24.7