Please tell me what I am doing wrong.

Provide the answers without using excel. I need to know the formula. Thank you.

The R\&D department is planning to bid on a large project for the development of a new communication system for commercial planes. The accompanying table shows the activities, times, and sequences required: b. What is the critical path? (You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer.) A-C-F-G-I ABEI A-D-H-I A-D-F-G-I and G each one week. Which would you shorten? (You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer.) B C D G E F d-1. What is the new critical path? (You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer.) A-C-F-G-I ABEI ? A-D-H-I A-D-F-G-I d-2. What is the earliest completion time for the new critical path