please help me with these questions

3) For each scenario below, explain what is counted in the GDP of the United States this year. a) Your professor decided to sell his entire collection of Brooks Brothers shirts on Poshmarkcom. b) You purchase an Investing for Dummies book at Barnes and Nobel. c) You purchase a vintage Porsche at a Mecum car auction and pay a 4.5% commission to the auction house. Would the car count? Would the commission count? d) The federal government sends you an unemployment check for $450 dollars. You pay $450 dollars to have your teeth cleaned and x-rayed. e) You order a Cuckoo clock om a city in Baden Baden Germany. 4) Suppose that inventories fall by $2 billion, consumption increases by $8 billion, unemployment insurance payments decline by $4 billion and imports rise $1 billion What will be the net effect on GPD? 5) Suppose that this year the United States has GDP $100 billion. Also, assume that I = 30 billion, C = 60 billion, and NX = -10 billion. How big is G