i just need some help with these problems

A portfolio has 45% of its value in IBM shares and the rest in Microsoft (MSFT). The volatility of IBM and MSFT are 33% and 35%, respectively, and the correlation between IBM and MSFT is 0 . What is the standard deviation of the portfolio? the market value of Fords' equity, preferred stock and debt are $6 billion, $3 billion, and $13 billion, respectively. Ford has a beta of 1.7, the market risk premium is 8%, and the risk-free rate of interest is 3%. Ford's preferred stock pays a dividend of $2.50 each year and trades at a price of $30 per share. Ford's debt trades with a yield to maturity of 9.5\%. What is Ford's weighted average cost of capital if its tax rate is 35% ? Assume Ford Motor Company is discussing new ways to recapitalize the firm and raise additional capital. Its current capital structure has a 25% weight in equity, 10% in preferred stock, and 65% in debt. The cost of equity capital is 13%, the cost of preferred stock is 9%, and the pretax cost of debt is 8%. What is the weighted average cost of capital for Ford if its marginal tax rate is 40%