Answer:
b(4) = -405
Explanation:
The first term of the sequence has been represented by 15.
The common ratio is -3
Since the first term is 15 you would have to multiply by -3 to find the next three terms.
B(1) = 15
B(2) = -45
B(3) = 135
B(4) = -405
The fourth term is -405
Answer:
-405