213, 209, 205,

Find the 30th term

a (30) = 97

Step-by-step explanation:

Notice how each new term is equal to the previous term, less 4. So this is a decreasing arithmetic sequence with common difference - 4 and first term 213:

The general a (n) = a (1) - 4 (n - 1) becomes

a (30) = 213 - 4 (30 - 1), or

a (30) = 97