(03.07 mc)
monica measures the number of bacteria that are living on her petri dish. each day, she measures the amount of change in the number of bacteria. these amounts
create a geometric sequence. use the data in the table to determine the sum of the amounts of change in the bacteria after the seventh day.
day. amount of bac
1. 3
2. -6
3. 12
4. -24
answers
a. -15
b. 15
c. 127
d. 129
i think it is c. 127 but i am not sure right !