Add punctuation: Their determinants are 1b and dI respectively so the solution for dY by Cramers Rule is
A: Their determinants are (1-b) and dI, respectively, so the solution for dY by Cramer's Rule is

Add punctuation: Innovative applications from the packaging industry were also presented to trade visitors in the Customer Center
A: Innovative applications from the packaging industry were also presented to trade visitors in the Customer Center.

Add punctuation: Special tours for groups from 50 People can be scheduled
A:
Special tours for groups (from 50 People) can be scheduled.