What is the answer

Question

f (n) =1.5n + 6

Answer 1

arithmetic sequence

7.5, 9, 10.5, 12, 13.5, 15, 16.5, 18, ....

common difference = d = 1.5

1st term = a1 = 7.5

nth term = an = a1 + (n-1)d

an = 7.5 +(n-1)(1.5)