B because 6 times 2 is 12...
One decade is 10 years+ 8 years is 18 total years
18 minus 9 is 9 years
Hope this helps
The series formed by using exponential property we get : 
What is Exponential Property?
- Properties of Exponents : It is also called power or degree.
- It tells us how many times the base will be multiplied by itself.
- The properties of exponents or laws of exponents are wont to solve problems involving exponents.
- These properties also are considered as major exponents rules to be followed while solving exponents.
Using exponential property on given values we get,

Complete series using exponent property is:
Learn more about exponential property here:
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Answer:
probability that Marnie and Noomi are both selected=0.1
Step-by-step explanation:
A group of 5 managers (Joon, Kendra, Lee, Marnie and Noomi), 2 people are randomly selected to attend a conference in Las Vegas.
the possibility of selecting 2 from 5 manages is 5C2 ways

There is only one choice of selecting Marine and Noomi from 5 managers
So probability of selecting Marine and Noomi is

Answer:
I don't know the answer to this one, sorry