Is that considered two equations?
1+1/3+1/3 because 1/3 and 1/3 have the same denominator.
Answer:
See Explanation
Step-by-step explanation:
The question is incomplete, as the sector, its area and the angle at the center are not given.
I will solve this using the following illusration
The area of a sector is:

Assume that:


The equation becomes

Simplify

Take: 

Cross Multiply

Solve for 


Take square roots


B. Estimation is good sometimes, but not in these cases.
Trust me, it's happened to me b4.
Yes, if that is the expenses he has to pay for all three of them. All you have to do is add up the all his expenses and multiple by 12