1. What is the difference between valuing a debt security and valuing the equity of a company? Explain

2. if an interest rate on a company's debt is 6% and that their tax rate is 35%.what would the cost of debt capital be? please show me the calculation

3.or if a company's market beta equals 0.8, the risk-free rate is 5%, and the market return equals 8%. how do you find the company's cost of equity capital. id like to see these calculations aswell, thanks so much in advance