Answer:
−57,395,628
Explanation:
The n-th term of a geometric sequence is given by ...
an = a1·r^(n-1)
Then the ratio of the 8th term to the 1st term is ...
a8/a1 = (a1·r^(8-1))/(a1·r^(1-1)) = r^7
and the common ratio is ...
(-8748/4)^(1/7) = -3
That makes the 16th term be ...
a16 = 4·(-3)^(16 -1) = -57,395,628