Question

Are my answers correct?
1. 2+4+8+ to 20 terms
A. -1,048,575 B. -2,097,150 C. 2,097,150
D. 3,145,725
(**D is my answer)

2. Find a1 for the geometric series in which Sn=4,882,812, r=-5, and n=10
A. -2 B. -3 C. 2 D. 3
(**C is my answer)

3. Find a fraction equivalent to the repeating decimal.
- 0.655
A. 655/99 B. 131/20 C. 131/200 D. 655/999
- 0.21
A. 7/23 B. 7/333 C. 21/1000 D. 655/999
(** both are C)

please help me check if i am doing this right!

Answer 1

Good job

Answer 2

are you sure they are correct?