Help!! this is economics

Uestion 7 you hold a portfolio consisting of a $5,000 investment in each of 20 different stocks. the portfolio beta is equal to 1.12. you have decided to sell a coal mining stock (b = 1.00) at $5,000 net and use the proceeds to buy a like amount of a mineral rights company stock (b = 2.00). what is the new beta of the portfolio?

Buyer henry is going to accept seller shannon's $282,500 counteroffer. when will this counteroffer become a contract. a. counteroffers cannot become contracts b. when henry gives shannon notice of the acceptance c. when henry signs the counteroffer d. when shannon first made the counteroffer

Which of the following is considered part of a country’s infrastructure?