patulong po maath, Geometric sequences​

Answer:
1.) D
2.)B
3.)D
4.)A
5.)D
B.
1.)A
2.)C
3.)D
4.)A
5.)D( I'm not sure po into)
C.
1.)1,500
2.)96
3.)768 is at 8th term.
4.)3/8
5.)I don't know it... I'm sorry