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

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,

$\frac{89.9}{99} = \frac{899}{990}$


$\frac{78.8}{89.9} = \frac{788}{899}$

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