Answer:
C
Step-by-step explanation:
Use the equation 
Input the numbers----> 
Simplify ----> 
Find the square root------->
I believe the answer is 17.
Answer:
B. Linear decreasing
Step-by-step explanation:
You will take the ratio divide it by the total and then multiply into 120
The First Person
1/12 × 120 = £10
The Second Person
3/12×120 = £30
The Third Person
8/12×120 = £ 80