Answer:
1 
Step-by-step explanation:
Note there is a common ratio between consecutive terms, that is
10 ÷ 20 = 5 ÷ 10 = 2
÷ 5 = 
Thus to obtain the next term in the sequence multiply the previous term by 
2
×
= 1 
Answer:
16.2
Step-by-step explanation:
By geometric mean theorem:

Answer:
i believe d. I could be wrong
Step-by-step explanation:
The answer to the following equation is the first one.
Answer:
1 i think
Step-by-step explanation:
hope this helps :) have a nice day :) :)