Question

4, 7, 12,...., 28, 39​

Answer 1

Step-by-step explanation:

19,

I hope I am right yes

Answer 2

Answer:

a=7

d=7-4=3

tn=39

tn=a+(n-1)d

39=7+3d-3

39-4=3d

35=3d

d=35/3