please answer 10.5 A and B

10.5 Security F has an expected return of 12 percent and a standard deviation of 9 percent per year. Security G has an expected return of 18 percent and a standard deviation of 25 percent per year. 2. What is the expected return on a portfolio composed of 30 percent of security F and 70 percent of security G? b. If the correlation between the returns of security Fand security G is 0.2, what is the stan- dard deviation of the portfolio described in part (a)