Please state which are true with an explanation

1.Two companies having the same Net Debt/Equity ratio and offering the same average returns in different states of the economy have the same beta

2.The CAPM formulae aims at computing the Cost of equity in a given company

3.Beta covers the idiosyncratic risk ?

4.Beta covers the market risk ?

5.The After-tax cost of debt is necessarily higher than the interest rate offered to the company by the bank

6.Beta emphasizes how sensitive the results of a given stock are compared to a well-diversified portfolio of shares

1. The higher the risk, the higher the beta, the higher the WACC and the lower the present value of future cash flows