The inverse of a 3 3 matrix may be found by transposing the:

a.

Coefficient matrix and multiplying the result by the determinant

b.

Matrix of cofactors and multiply the result by the reciprocal of the determinant.

c.

Matrix cofactors and multiply the result by the determinant

d.

Coefficient matrix and multiplying the result by reciprocal of the determinan

2. Which of the following is not an assumption of the economic order quantity model

a.

Demand is known, constant, and independent

b.

Production and use can occur simultaneously.

c.

Quantity discounts are not possible.

d.

Lead time is known and constant.

3.Which of the following statements regarding critical paths is true?

a.

The shortest of all paths through the network is the critical path.

b.

Some activities on the critical path may have slack

c.

Every network has only one critical path.

d.

The longest of all paths through the network is the critical path.