A sequence can be generated by using the equation shown, where a1 = 12 and n is a whole number greater than 1

an = 1.5 + a(n-1)
What are the first four terms in the sequence?

12
13.5
16
19.5

12
13.5
15
16.5

12
13.5
16.5
21

12
13.5
15.5
18

The first four terms in the sequence are:

12
13.5
15
16.5