answer some question for project management

you can use the ppt for resource.

1-Why would it not decrease the project duration if you would crash an activity not on the critical path?

2-Lengthening the duration of a project generally will increase which type of costs?.......................................Why?

3-Why might management have to select a project that pertains to safety or the environment rather than one which has better rate of return?  

4-The sum of the slack times of activities not on the critical path is always ……………..

5-The duration of paths on the network that are not critical are always less than the duration of the ……………………………………………….

6-The NPV of a project with an installation cost of $150,000 (to be paid at the start of the project) in a project that will generate a savings to the owner of $50,000 for 5 years (5 savings payments) without taking into account the time value of money is equal to……………………………………..

7- The duration of the critical path through a network is equal to the ………………………… of the project.