~~i raised the points and will give brainliest its also multiple choice~~
which describes the type of sequence in 99, 89.9, 78.8, 68.7, . . . ?
a) neither geometric nor arithmetic
b) geometric
c) arithmetic
d) both arithmetic and geometric
( tell me why you picked your answer)

Option 'a' is correct.

Step-by-step explanation:

Since we have given that

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

Here,

But we can see that there is minor difference between the consecutive terms:

So, we will go for common difference whether it is same or not.

Their difference are not common.

So, It is neither geometric nor arithmetic.

Hence, Option 'a' is correct.