21. Consider the geometric sequence-8, 16, -32, ... Which of the following statements
are true?
a. The common ratio is 2.
b. The 5th term of the sequence is -128.
C.
The 7th term is 4 times the 5th term.
d. The 8th term is 1024.
e. The 10th term is greater than the 9th term.