https://vle.mathswatch.co.uk/images/questions/question17028.png
Can you send the Equation or the screenshot?
here is the scren shot
a 31 50
b Working backwards
3rd term = 33 - 19 = 14
2nd term = 19 - 14 = 5
1st term = 14 - 5 = 9
c
1st term = n - m
4th term = m + n
5th term = n + ( m + n) = m + 2n
