ANSWER

EXPLANATION
The sum of the first
terms of a geometric sequence is given by;

Where
, is the number of terms and
is the first term.
When
, we have
, we get;





Answer:
7/4,
Step-by-step explanation:
it cant be simplified
Only 20%of earths water is useable
Answer:
1/48
Step-by-step explanation:
the steps are in the picture