Find the 22nd term

Question

10.5, 11, 11.5, 12, 12.5, ...

Answer 1

To find a certain term, use the following equation:

1. x_n = a + d(n-1)
2. a is the first term of the series
3. d is the difference between the terms
4. n is the term you are looking for 
5. 22nd term = 10.5 + 0.5(22-1)
6. 21