Economics Homework Help

I’m working on a Economics question and need guidance to help me study.

Q1. What are thedifferences between exogenous and endogenous variables?

Q2. Why we used graph and model in economics? what does mean by flexible and sticky prices?

Q3. Define GDP, Consumption, Investment, Government Purchases and Net export?

Q4. What is Consumer price index (CPI), and how the Bureau of labor statistics (BLS) construct the CPI? Define Interest rate with one example?

Q5. What is productivity and how many is the basic determinants of productivity?

Discuss and answer each question one by one, 200-400 words are enough, attach the outline, in MLA format, thanks