Answer:
They should operate Mine 1 for 1 hour and Mine 2 for 3 hours to meet the contractual obligations and minimize cost.
Explanation:
The formulation of the linear programming is:
Objective function:

Restrictions:
- High-grade ore: 
- Medium-grade ore: 
- Low-grade ore: 
- No negative hours: 
We start graphing the restrictions in a M1-M2 plane.
In the figure attached, we have the feasible region, where all the restrictions are validated, and the four points of intersection of 2 restrictions.
In one of this four points lies the minimum cost.
Graphically, we can graph the cost function over this feasible region, with different cost levels. When the line cost intersects one of the four points with the lowest level of cost, this is the optimum combination.
(NOTE: it is best to start with a low guessing of the cost and going up until it reaches one point in the feasible region).
The solution is for the point (M1=1, M2=3), with a cost of C=$680.
The cost function graph is attached.
Answer:
C) Recurrent Disability provision
Explanation:
The human body is a fantastic machine but sometimes when you have health problems they don't show up immediately.
For example you might get hit on the right side of your head severely and lose partial hearing from your right ear, but in a couple months you might notice that your short term memory has also been affected. Both disabilities were caused by the injury although one showed up before the other.
The insurance company has to provide the disability benefits without a new elimination period under the recurrent disability provision.
Answer: The correct answers are a) & b). That is MARTHA, MARTHA; JANE.
Explanation: Absolute advantage exists when a party can oroduce a highe quantity of a good or product. This is the situation with Martha in her productions.
Comparative advantage on the other hand is when a party has a lower opportunity cost. This exists in both the production of quilts and chocolate chip cookies.