Answer:
25.
Step-by-step explanation:
This is called an Arithmetic sequence with common difference -5.
Adding -5 to the 4th term (30) gives the fifth term (25).
The explicit formula for the nth term:
an = a1 + d(n - 1) where a1 = first term and d = the common difference.
So here it is an = 45 + (-5)(n - 1)
= 45 - 5n + 5
= 50 - 5n.
