Question

Which answer describes the type of sequence? 99, 89.9, 78.8, 68.7, ... a)geometric

b)arithmetic

C)neither arithmetic nor geometric

Answer 1

c. neither arithemtic nor geometric

Answer 2

ANSWER

C)neither arithmetic nor geometric

Step-by-step explanation

The given sequence is


`99,89.9,78.8,68.7,...`

Let us check to see if there is a constant difference.


`89.9 - 99 = - 9.1`


`78.8 - 89.9 = - 11.1`


The two difference are not the same.

Since there is no constant difference, the sequence is not arithmetic.


Let us check to see if there is a common ratio,


`(89.9)/(99) = (899)/(990)`



`(78.8)/(89.9) = (788)/(899)`

Since the ratio is not the same,the sequence is not geometric too.


The sequence is neither arithmetic nor geometric.


The correct answer is C