Assuming the sequence goes on like this 11,-33,99,-297,891,...,
its general formula is

So, the 9th term is
B.34m u add 12+12+5+5=34m or u cadn do 12x2+5x2=34m
Answer:
The ratio is 15:5 or 3:1. If Marianne is 3 years old, her brother is 1. And it is proportional...
Step-by-step explanation:
Factors
25 = 1,5,25
99 =1,3,9,11,33,99
Greatest Common Factor : 1