Question

n

Answer 1

Since we are given r here... so it means we have a geometric sequence, where r is the common ratio between each number in the sequence and a1 is the 1st term....
The geometric formula is an=a1 x r^(n-1) so plugin a1 and r
an = 4 x -5^(n-1)
Plug in n=5 to find the fifth term
a5 = 4 x -5^(5-1)
a5 = 4 x -5^4 = -2500....

Answer 2

@paki thank you!

Answer 3

pleasure