Question

I kinda get this problem but i just want to see what other answers people got to see if i did the question wrong.

Answer 1

an=a1+d(n-1)
fisrst term is a1
common difference is d

decreases by 4 each time
first term is 19
an=19-4(n-1)
distribute
an=19-4n+4
an=23-4n
you are right

Answer 2

You did not do the question wrong. Your answer would be correct. ;-)