Answer:
geometric
Step-by-step explanation:
Neither arithmetic nor geometric
Since 99-89.9= 9.1, and 89.9 - 78.8 = 11.1, the sequence is not arithmetic.
Likewise 89.9/99=0.908 and 78.8/89.9 = 0.876 makes it not a geometric sequence
Given
Required
This is calculated as:
the number has been increased by 79
The answer is 80 because 10x8 is 80 and the nearest 10 means it need to have a 0 behind so it is 80