For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

Step-by-step explanation:

To find recursive formula in a geometric sequence, you need to first find the common ratio, 'r', between the numbers in the given data set.  From the data set given, it appears that the previous number is multiplied by so, r = .

Recursive formula involves two other variables:

the term in the sequence

=the term before the term

So, the final formula is:  

126.66 m²

step-by-step explanation:

the pertinent area formula is a = πr², where r is the radius.

here, a = π(6.35 m)² = 40.32π, or approximately 126.66 m²

if x = 1, then the answer is 3.5