Please answer these two questions, label question 1 and 2 so i can see which ans

Please answer these two questions, label question 1 and 2 so i can see which answer is for which question please.
this is to demonstrated understanding of weekly reading assignments and research in order to respond. Post includes answers with substance (including examples) showing comprehension. and includes a scholarly reference other than the assigned textbook. (Scholarly is defined as a peer-reviewed/professional journal article published within the last 5 years). Post also contain proper grammar and spelling.
Question 1. What do you think is the most important role of a project manager? Do you think that role has or will change over time? Be sure to also address how a project manager selects a project in your discussion. Do not forget to back up your ideas with academic sources noted in APA format.
Question 2. Discuss at least four potential problems in creating accurate duration estimates for activities and two methods for dealing with each potential problem. Remember to cite all sources in APA format.
iam currently using
Required Textbook:

Kloppenborg, T. J. (2022). Contemporary Project Management (5th ed). Mason, OH: Cengage. ISBN: 9780357715734
Question 1 chapter 1-4
Question 2 chapter 5-8
thank you