System admin - wants to make sure that when an opportunity is closed - nobody can modify it.

Your organization sells a product that requires your customers to pay all at once but receive the product in increments. What should be your first step in setting up Product schedules?

The sales manager at Cloud Kicks (CK) wants to make sure the accounts that CK serves are happy. One way they track this is by how many open cases an account has with CK. The sales manager asks CK's administrator to build a report to show Accounts with Open Cases.
What report type would this be?

Which two types of metadata should be migrated between environments using change sets? (Choose two.)

Recruiters at universal containers wants to associate positions with their related job applications using two custom objects position and job application. a job application must always have a related position. if a position is deleted, the corresponding job applications are deleted.
what type of object relation ship will meet this requirement?