Final answer:
The formula for finding the first term of a geometric progression is a = FV / (1 + r)^(n-1) and the formula for finding the sum of a geometric progression is S = a * (1 - r^n) / (1 - r).
Step-by-step explanation:
In a geometric progression (GP), the first term can be found using the formula:
a = FV / (1 + r)^(n-1)
where 'a' is the first term, 'FV' is the future value, 'r' is the common ratio, and 'n' is the number of terms.
The sum of a geometric progression can be found using the formula:
S = a * (1 - r^n) / (1 - r)
where 'S' is the sum of the GP, 'a' is the first term, 'r' is the common ratio, and 'n' is the number of terms.