Describe the elements of M2(Z) that have multiplicative inverses.? Solution all the elements in M2(Z) are 2x2 matrices over Z Hence their determinant are also integers. det(AB) = det(A) det(B) if B is inverse of A then det(AB) = 1 if both A,B are M2(Z) and they are inverses of one other then det (A) = det(B) = +1 or -1 Say A = (a b) (c d) and ad-bc = +1 or -1 then B = (d -b) (-c a) Then AB = I Hence the only Matrices in M2(Z) are those whose determinant is +1 or -1.

1. Describe the environment under which the ERP system was being implemented. Was due
diligence conducted in choosing the ERP vendor?
Solution
Enterprise Resource Planning (ERP) Systems are integrated software packages that contain a
number of business modules such as finance, human resource, sales, budgeting, manufacturing
and process specific to an industry all within itself.
An ERP System as such available is easy to use and maintain but when there is a need for
customizing it in accordance to an organisation